Flowering phenology of Populustremuloides and P. grandidentata and the potential for hybridization

1980 ◽  
Vol 10 (2) ◽  
pp. 218-223 ◽  
Author(s):  
Kurt S. Pregitzer ◽  
Burton V. Barnes
Keyword(s):  
Gene Flow ◽  
Flowering Time ◽  
Seed Production ◽  
Flowering Phenology ◽  
Hybrid Seed ◽  
Hybrid Seed Production ◽  
Strong Potential ◽  
Hybrid Seeds ◽  
Northern Michigan

Flower phenologies of Populustremuloides, P. grandidentata, and P. ×smithii were monitored for 39 clones in southeastern Lower Michigan, U.S.A., and 73 clones in northern Lower Michigan. In southeastern Michigan the two species were generally found to be reproductively isolated where average flowering times were compared. Populustremuloides exhibited greater intra- and interclonal variation than P. grandidentata and flowered for a significantly longer period. However, overlap in flowering times occurred in southeastern Michigan indicating a potential for hybridization and gene flow. Populusgrandidentata female clones pollinated by P. tremuloides males were most likely to produce hybrid seeds. Small, late-developing female catkins of P. tremuloides also showed strong potential for hybrid seed production. Natural F1 hybrids were intermediate in flowering time between the parents. Therefore, phenology is not a complete barrier to natural backcrossing in southeastern Lower Michigan. Little overlap occurred in northern Michigan, thus strongly limiting the potential for hybridization.

THE EFFECT OF OVULE POSITION ON THE FREQUENCY OF HYBRID AND INBRED SEED IN FABA BEAN

1990 ◽  
Vol 70 (1) ◽  
pp. 79-82 ◽  
Author(s):  
G. DUC ◽  
G. G. ROWLAND
Keyword(s):  
Vicia Faba ◽  
Seed Production ◽  
Faba Bean ◽  
Plant Stress ◽  
Hybrid Seed ◽  
Hybrid Seed Production ◽  
Vicia Faba L ◽  
Hybrid Seeds ◽  
Ovary Position ◽  
Ovule Position

The effect of ovule and ovary position on the frequency of hybrid seed production of faba bean (Vicia faba L.) was measured at Dijon, France and Saskatoon, Canada. Even though there was far greater ovule fertilization frequency at Dijon (72%) than at Saskatoon (30%) the frequency of hybrid seed was significantly greater at Saskatoon (24%) than at Dijon (15%). Neither the position of the ovule within the ovary nor the position of the raceme on the stem had any effect on the production of hybrid seed. However, at both locations the highest position within a raceme produced a significantly greater proportion of hybrid seeds. It is proposed that under the effect of intra- or inter-plant stress, developing ovaries containing hybrid embryos may be selectively retained.Key words: Vicia faba, ovule fertilization, outcrossing, faba bean

scholarly journals Blend wheat AL-type hybrid and using SSRs to determine the purity of hybrid seeds

2021 ◽  
Author(s):  
Yingbin Nie ◽  
Dezhen Kong ◽  
Fenjuan Cui ◽  
Wei Sang ◽  
Peiyuan Mu ◽  
...  
Keyword(s):  
Seed Production ◽  
Wheat Yield ◽  
Regression Equation ◽  
Hybrid Seed ◽  
Hybrid Seed Production ◽  
Male Sterile ◽  
Purity Testing ◽  
Hybrid Seeds ◽  
Seed Setting Rate ◽  
Simple Sequence

Heterosis is a promising approach to increase wheat yield from a limited planting area. In this study, a fine quality restorer line 99AR144-1 and three stable male sterile lines, AL18A, AL36A and AL20A, were assigned as male and female, respectively. Seeds of the wheat line 99AR144-1 and three male sterile lines were mixed according to different proportions and then planted at an experimental farm at the Xinjiang Academy of Agri-Reclamation Sciences from 2013 to 2016. When the mixed sowing ratios of combinations 2 (AL36A × 99AR144-1) and 3 (AL20A × 99AR144-1) were 6 to 8%, the seed production yields were higher than the control; the yield of hybrid seed production increased by 98.8 and 19.9%, respectively. This increase was attributed to a rise in the outcrossing seed setting rate. Further, this study used the Xbarc-8 SSR (simple sequence repeat) molecular marker to identify the purity of blend hybrid seeds and establish a regression equation for hybrid seed purity testing. The coefficient of the regression equation were 0.9878 and 0.9689 respectively, which shows that the purity of hybrids can be accurately predicted by using this equation. This method can quickly and accurately identify the seed purity in mixed seed production.

scholarly journals Inbred and hybrid seed production potentiality of tomato (Lycopersicon esculentum) genotypes and their yield performance during summer

2014 ◽  
Vol 39 (1) ◽  
pp. 13-21 ◽  
Author(s):  
L Yesmin ◽  
MS Islam ◽  
MM Rahman ◽  
MN Uddin ◽  
S Ahmad
Keyword(s):  
Seed Production ◽  
Seed Yield ◽  
Agricultural Research ◽  
Fruit Weight ◽  
Fruit Yield ◽  
Hybrid Seed ◽  
Hybrid Seed Production ◽  
Cross Combination ◽  
Yield Performance ◽  
Hybrid Seeds

An investigation was made with a view to estimating inbred and hybrid seed production potentiality as well as fruit yield potentiality of 11 tomato genotypes and their hybrids during November 2009 to September 2010 at Bangladesh Agricultural Research Institute, Gazipur. The highest number of fruits per plant was recorded from the genotype C41 (59.66). The highest fruit yield per plant (2.94 kg) was recorded from the genotype WP8 followed by that of C11 (2.93 kg). In respect of seed yield performance, the genotype C51 produced the highest number of seeds per fruit (47.66), while the line C41 produced the highest seed yield per plant (7.66 g). Per hectare seed yield varied from 263.0 kg (C41) to 53.79 kg (MP5). The highest per plant (6.33 g) and per hectare (139.26 kg) hybrid seeds were produced by the cross combination of C11 X C51 followed by that of WP8 × C11. The fruit weight and fruit yield of the hybrids were much higher compared to their superior parents during the summer season. Among the six tomato hybrids, WP7 X C51 had the highest fruit weight (67.60 g) and produced the highest fruit yield per plant (1.43 kg) followed by BARI Hybrid Tomato-4 (1.24 kg). The other two hybrids, WP8 X C51 (1.08 kg/plant) and C51 X WP10 (1.1 kg/plant) were also found promising. DOI: http://dx.doi.org/10.3329/bjar.v39i1.20057 Bangladesh J. Agril. Res. 39(1): 13-21, March 2014

scholarly journals Proportion of parental line (A receptor and R pollinator) seeds improving rice hybrid production

2020 ◽  
Vol 43 ◽  
pp. 45629
Author(s):  
Adriano Stephan Nascente ◽  
Paulo Ricardo Reis Fagundes ◽  
Vitor Henrique Vaz Mondo ◽  
Mabio Chrisley Lacerda
Keyword(s):  
Seed Production ◽  
Grain Quality ◽  
Hybrid Seed ◽  
Limiting Factors ◽  
High Price ◽  
Parental Line ◽  
Rice Grain ◽  
Hybrid Seed Production ◽  
Rice Hybrid ◽  
Hybrid Seeds

The high price of rice hybrid seeds is one of the major limiting factors for increasing the use of this technology. An important step toward minimizing high rice hybrid seed cost is developing techniques that help improve hybrid seed yield. Our goal was to determine the proportion of seeds of line A (receptor) and line R (pollinator) that, under mixed sowing, would allow optimized rice hybrid seed production and grain quality. Trials were performed for two growing seasons in the southern region of Brazil. The cultivar INTA Puita was used as a pollinator and line 464 A as receptor. The experimental design was a randomized block with four replications. Treatments included six proportions of seeds of the INTA Puita (0.75, 1.5, 3.0, 6.0, 12.0, and 24.00%) mixture with seeds of line 464 A (99.25, 98.50, 97.00, 94.00, 88.00, and 76%, respectively). By increasing the percentage of the pollinator seeds (INTA Puita CL) from 0.75 to 24% in the mixture with the receptor (line 464 A), we increased yield of INTA Puita CL grains (7 to 2676 kg ha-1) and hybrid seeds (279 to 1493 kg ha-1). The mixture of different proportions of INTA Puita CL (pollinator) with the receptor (line 464 A) did not change the rice grain quality or the production cost. The cost of production per kg of hybrid seeds decreased quadratically with the increasing percentage of the pollinator (INTA Puita CL), from US$ 6.71 to US$ 1.23. Revenue achieved from the commercialization of the grains of INTA Puita CL with hybrid seeds 464 A showed quadratic increases with the increased percentage of INTA Puita cl in the mixture. Our results showed a potential technique that could be used to improve hybrid seed production, reduce cost per kg of hybrid seed and improve revenue from producing rice hybrid seeds.

Techniques of Hybrid Seed Production in Egg Plant

2001 ◽  
Vol 3 (2) ◽  
pp. 39-47
Author(s):  
Vindhyachal Prasad ◽  
S. K. Dasgupta ◽  
S. K. Tripathi
Keyword(s):  
Seed Production ◽  
Hybrid Seed ◽  
Hybrid Seed Production ◽  
Egg Plant

scholarly journals Molecular regulation ofZmMs7required for maize male fertility and development of a dominant male-sterility system in multiple species

2020 ◽  
Vol 117 (38) ◽  
pp. 23499-23509 ◽  
Author(s):  
Xueli An ◽  
Biao Ma ◽  
Meijuan Duan ◽  
Zhenying Dong ◽  
Ruogu Liu ◽  
...  
Keyword(s):  
Male Sterility ◽  
Seed Production ◽  
Target Genes ◽  
Hybrid Seed ◽  
Molecular Regulation ◽  
Dominant Male ◽  
Hybrid Seed Production ◽  
Maize Breeding ◽  
Pollen Exine ◽  
Multiple Species

Understanding the molecular basis of male sterility and developing practical male-sterility systems are essential for heterosis utilization and commercial hybrid seed production in crops. Here, we report molecular regulation by genic male-sterility genemaize male sterility 7(ZmMs7) and its application for developing a dominant male-sterility system in multiple species.ZmMs7is specifically expressed in maize anthers, encodes a plant homeodomain (PHD) finger protein that functions as a transcriptional activator, and plays a key role in tapetal development and pollen exine formation. ZmMs7 can interact with maize nuclear factor Y (NF-Y) subunits to form ZmMs7-NF-YA6-YB2-YC9/12/15 protein complexes that activate target genes by directly binding to CCAAT box in their promoter regions. Premature expression ofZmMs7in maize by an anther-specific promoterp5126results in dominant and complete male sterility but normal vegetative growth and female fertility. Early expression ofZmMs7downstream genes induced by prematurely expressed ZmMs7 leads to abnormal tapetal development and pollen exine formation inp5126-ZmMs7maize lines. Thep5126-ZmMs7transgenic rice andArabidopsisplants display similar dominant male sterility. Meanwhile, themCherrygene coupled withp5126-ZmMs7facilitates the sorting of dominant sterility seeds based on fluorescent selection. In addition, both thems7-6007recessive male-sterility line andp5126-ZmMs7Mdominant male-sterility line are highly stable under different genetic germplasms and thus applicable for hybrid maize breeding. Together, our work provides insight into the mechanisms of anther and pollen development and a promising technology for hybrid seed production in crops.

Sign in / Sign up

Export Citation Format

Share Document