The effect of the Triticum timopheevi nucleo-cytoplasmic system on the performance of an F1 hybrid wheat

1985 ◽  
Vol 36 (4) ◽  
pp. 553 ◽  
Author(s):  
JJ Walcott
Keyword(s):  
Seed Set ◽  
Fertility Restoration ◽  
Hybrid Wheat ◽  
F1 Hybrid ◽  
Triticum Timopheevi ◽  
Hybrid Genotype ◽  
Flour Protein ◽  
Flour Colour ◽  
Significant Difference ◽  
Plant Stand

Hybrid performance may be affected by the T. timopheevi nucleo-cytoplasmic system for producing hybrid wheat. Its effects were investigated in three experiments which compared the same hybrid genotype produced either in T. aestivum cytoplasm or in T. timopheevi cytoplasm. Few consistent differences were found between the two hybrids. The only significant difference in grain yield was associated with a significantly reduced seed set in the T. timopheevi hybrid, and suggested a likely effect of location on the degree of fertility restoration achieved. The T. timopheevi nucleo-cytoplasmic system appeared to reduce plant stand and test weight, but to improve flour colour and flour protein content relative to the T. aestivum hybrid.

Levels of heterosis for yield and quality in an F1 hybrid wheat

1985 ◽  
Vol 36 (4) ◽  
pp. 545 ◽  
Author(s):  
OW Boland ◽  
JJ Walcott
Keyword(s):  
Side Effects ◽  
Hybrid Wheat ◽  
Seeding Rate ◽  
Yield Performance ◽  
F1 Hybrid ◽  
Flour Protein ◽  
Yield And Quality ◽  
Expected Values ◽  
Milling Yield ◽  
Yield Trials

A newly released F1 hybrid wheat (Hybrid Titan) was compared with its parents and three commercial check cultivars in yield trials over 16 site years. Mid-parent heterosis varied considerably (100-127%) over the sites and averaged 111%. However, high-parent and high-check cultivar heterosis levels were much lower (99-119%), most likely a consequence of the low yield of the male parent. A concurrent seeding rate trial showed that lower levels of heterosis resulted if the seeding rate of the hybrid was reduced below that of the parent and check cultivars. Quality tests performed on the harvested grain showed some characters deviating considerably from expected values. The most significant of these were lower milling yield, flour protein content, and water absorption. The T. timopheevi nucleo-cytoplasmic system for producing hybrid wheat was implicated as having likely side effects on yield performance and quality. The study emphasized the need for both parents to be high-yielding and to have good combining ability for both yield and quality.

scholarly journals Introducing intrauterine antibiotic infusion as a novel approach in effectively treating chronic endometritis and restoring reproductive dynamics: a randomized pilot study

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Konstantinos Pantos ◽  
Mara Simopoulou ◽  
Evangelos Maziotis ◽  
Anna Rapani ◽  
Sokratis Grigoriadis ◽  
...  
Keyword(s):  
Fertility Restoration ◽  
Statistical Significance ◽  
Antibiotic Administration ◽  
Oral Antibiotic ◽  
Treatment Rate ◽  
Chronic Endometritis ◽  
Vitro Fertilization ◽  
Significant Difference ◽  
Antibiotic Infusion

AbstractThe chronic nature of Chronic Endometritis (CE) along with the challenging management and infertility entailed, call for cutting-edge therapeutic approaches. This study introduces the novel treatment of intrauterine antibiotic infusion (IAI) combined with oral antibiotic administration (OAA), and it assesses respective performance against the gold standard treatment of OAA. Data sourced herein reports on treatment efficiency and fertility restoration for both patients aiming to conceive naturally or via In Vitro fertilization. Eighty CE patients, 40 presenting with recurrent implantation failure, and 40 with recurrent pregnancy loss, were enrolled in the IVF and the natural conception arm respectively. Treatment was subjected to randomization. Effectively treated patients proceeded with either a single IVF cycle or were invited to conceive naturally over a 6-month period. Combination of IAI and OAA provided a statistically significant enhanced effectiveness treatment rate (RR 1.40; 95%CI 1.07–1.82; p = 0.01). No statistically significant difference was observed regarding the side-effects rate (RR 1.33; 95%CI 0.80–2.22; p = 0.52). No statistically significant difference was observed for either arm regarding live-birth rate. Following an intention-to-treat analysis, employment of IAI corresponds to improved clinical pregnancy rate-albeit not reaching statistical significance. In conclusion, complimentary implementation of IAI could provide a statistically significant enhanced clinical treatment outcome.

scholarly journals Inheritance of fertility restoration of A4 cytoplasm in pearl millet [Pennisetum glaucum (L.) R. Br.]

2020 ◽  
Vol 80 (01) ◽  
Author(s):  
J. Jorben ◽  
S. P. Singh ◽  
C. Tara Satyavathi ◽  
S. Mukesh Sankar ◽  
Jayant S. Bhat ◽  
...  
Keyword(s):  
Pearl Millet ◽  
Pollen Fertility ◽  
Seed Set ◽  
Pennisetum Glaucum ◽  
Fertility Restoration ◽  
Duplicate Genes ◽  
New Delhi ◽  
Regional Centre ◽  
Fertility Restorers ◽  
Mode Of Inheritance

Present investigation was carried out to study the mode of inheritance of fertility restoration for A4 cytoplasm using pollen fertility and seed set per cent as criterion in determining the fertile and sterile plants. Two CMS lines of A4 cytoplasm were crossed with two fertility restorers generating four F1 crosses, namely, ICMA 99111 x PPMI 1003, ICMA 99111 x PPMI 1087, ICMA 03999 x PPMI 1003 and ICMA 03999 x PPMI 1087, their F2s and backcross generations. All the F1s were completely fertile indicating complete fertility restoration. F2s and backcross generations were evaluated at IARI, New Delhi and IARI Regional Centre, Dharwad during summer 2017 and χ 2 test was applied to test the significance. At both the locations, all the F2 segregating populations fit well into a Mendelian ratio of 15:1 indicating digenic duplicate dominance of fertility restoring genes with χ 2 value of 0.82, 2.90, 0.04, 3.97, 4.86, 4.98, 0.02, 1.26, 3.15, 4.98, 3.15 and 0.02. The F2 hypothesis was verified with the observed frequency of segregating plants fitting well into 3:1 ration with χ 2 value of 5.45, 1.93, 4.93, 0.60, 2.83, 0.44, 4.94, 2.77, 3.33, 0.13, 4.08 and 1.51. It is further confirmation of the findings that fertility restoration is indeed governed by two duplicate genes. Association between pollen fertility and seed set per cent was significant and positive.

The relationship of grain shrivelling to the milling and baking quality of three winter wheat cultivars grown with different rates of nitrogen fertilizer

1978 ◽  
Vol 90 (2) ◽  
pp. 445-446 ◽  
Author(s):  
Rosemary A. Bayles ◽  
A. D. Evers ◽  
Gillian N. Thorne
Keyword(s):  
Nitrogen Fertilizer ◽  
Specific Weight ◽  
Application Rate ◽  
Content Quality ◽  
Baking Quality ◽  
Flour Protein ◽  
Flour Colour ◽  
Winter Wheat Cultivars ◽  
Genetically Determined ◽  
Relationship Of

It is generally assumed that poorly filled, or shrivelled wheat grain gives poor flour yields on milling, due to low endosperm content. Quality standards therefore often impose minimum limits of specific weight and grain size with the intention of excluding shrivelled samples. Although milling and baking quality are partly genetically determined, certain of their components are strongly influenced by environment. Flour protein, loaf score and alpha-amylase activity may be improved by nitrogen fertilizer (Pushman & Bingham, 1976), although the reaction of other characters is sometimes less favourable. Reduced flour yields and deterioration of flour colour have been reported at high rates of nitrogen fertilizer (Fuller & Stewart, 1968), and grains frequently become smaller and more shrivelled as application rate is increased (Bayles, 1977 c).

scholarly journals Evaluation of Different Vaireties of Onion and their Transplanting Times for Off-season Production in Mid Hills of Nepal

1970 ◽  
Vol 7 ◽  
pp. 21-26 ◽  
Author(s):  
IP Gautam ◽  
B Khatri ◽  
GP Paudel
Keyword(s):  
Plant Height ◽  
Local Market ◽  
Ecological Research ◽  
Plot Size ◽  
Research Journal ◽  
Novel Technology ◽  
Significant Difference ◽  
Neck Thickness ◽  
Plant Stand ◽  
Bulb Yield

A field experiment was conducted at the agro-ecological research site (AER site) of the RegionalAgriculture Regional Station, Lumle, at Deurali in Palpa (1200 masl) during rainy season of2004 and 2005. The main objective of the experiment was to evaluate the different varieties ofonion and their transplanting time for off-season production in mid hill conditions. Treatmentswere four onion varieties, namely LR-241, N-53, Nasik Red and Red Creole and four transplantingdates as 25 July, 5 August, 15 August, and 25 August. The trial was conducted in RCBD withfactorial arrangement of treatments and replicated three times considering farmer as a replication.The plot size was maintained 1.4 m2 (1.4 x 1 m2). Observation was recorded on plant height, plantstand at maturity, diameter and length of bulbs, neck thickness and yield of green bulbs and greentops. The varieties showed a significant different only on the fresh bulb production. Transplantingdates showed a significant difference on the plant height, plant stand at maturity and marketablebulb production. The highest fresh bulb yield (16.63 t ha-1) observed on the variety N-53. Similarly,August 15 transplanting date produced the highest bulb yield (15.31 t ha-1) among four transplantingdates. This novel technology for off-season onion bulb production through seedlings would be goodopportunity for increasing the income of many hill farmers which have no access to low land andirrigation facility during normal onion production season. The production of green tops in this periodis consumable and easily saleable in the local market. So farmers get extra income from thistechnology.Key words: Bulb yield; off-season onion; transplanting date; varietiesDOI: 10.3126/narj.v7i0.1862Nepal Agriculture Research Journal Vol.7 2006 pp.21-26

Gene flow between introduced and native Eucalyptus species: crossability of native Tasmanian species with exotic E. nitens

2005 ◽  
Vol 53 (5) ◽  
pp. 465 ◽  
Author(s):  
R. C. Barbour ◽  
B. M. Potts ◽  
R. E. Vaillancourt
Keyword(s):  
Gene Flow ◽  
Native Species ◽  
Seed Set ◽  
Pollen Competition ◽  
F1 Hybrids ◽  
Eucalyptus Species ◽  
F1 Hybrid ◽  
Genetic Pollution ◽  
Morphometric Analyses ◽  
Natural Hybridisation

Eucalyptus nitens (Deane & Maiden) Maiden has been extensively introduced to the island of Tasmania for plantation purposes. Natural hybridisation with two native species has already been confirmed and this study aimed to determine which other Tasmanian native species could potentially hybridise with E. nitens. Controlled and supplementary pollinations with E. nitens pollen were undertaken on all Tasmanian native species that are potentially at risk of exotic gene flow and hence genetic pollution. Across the seven species tested by using controlled pollinations, seed set per flower, following E. nitens pollinations, was significantly less than for intraspecific outcross pollinations. No significant differences were evident in the percentage of seed that germinated or the percentage of germinants that grew into healthy seedlings in the glasshouse. Hybridity was verified by morphometric analyses and F1 hybrid seedlings were clearly differentiated from parental species and generally intermediate in morphology. Supplementary E. nitens pollination of open-pollinated native flowers was conducted to simulate natural pollination where pollen competition would occur. Seven of the fifteen species tested produced F1 hybrids in this case; however, further crossing is required to verify failed cross combinations. Although E. nitens can potentially hybridise with many native species, the results from both supplementary and controlled pollinations suggest the presence of post-pollination barriers of varying strength that need to be considered in assessing the risk of exotic gene flow from plantations.

scholarly journals Resynthesis of new R lines in Brassica napus L.

2016 ◽  
Vol 41 (3) ◽  
pp. 529-540
Author(s):  
MA Miah ◽  
MG Rasul ◽  
MAK Mian
Keyword(s):  
Brassica Napus ◽  
Fertility Restoration ◽  
Winter Season ◽  
Nuclear Gene ◽  
Restorer Line ◽  
Male Sterile ◽  
Brassica Napus L ◽  
F1 Hybrid ◽  
First Case ◽  
F2 Generation

Identification of male fertility restorer genotypes for rapeseed CMS lines towards hybrid development in spring habit rapeseed (Brassica napus L.) adapted for short day winter season was studied. The experiment was conducted at the experimental farm and laboratory of Bangabandhu Sheikh Mujibur Rahman Agricultural University, Salna, Gazipur during October, 2008 to March, 2011. An exotic CMS-based F1 hybrid of rapeseed was selfed to get F2 generation with a view to resynthesizing restorer line. As a result a restorer line for Nap248A Z1 and Nap248A Z2 cytoplasmic male sterile lines was identified in the F3 generation of the exotic F1 rapeseed hybrid which appears as the first case so far reported as achievement in Bangladesh in this regard. Genetic analysis further revealed fertility restoration for Nap248A Z1 and Nap248A Z2 cytoplasmic male sterility was controlled by a single dominant nuclear gene as a simple genetic phenomenon.Bangladesh J. Agril. Res. 41(3): 529-540, September 2016

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