scholarly journals Effects of pH, Photoperiod, and Nutrient on Germination and Growth of Calymperes erosum C. Muell. Gemmaling

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Anthony Zinno Ogbimi ◽  
Yetunde Biodun Owoeye ◽  
Victor Oluwaseyi Ibiyemi ◽  
Akpos Valentino Bofede
Keyword(s):  
Nutrient Concentration ◽  
Carbon Gain ◽  
Continuous Darkness ◽  
Significant Difference ◽  
Photosynthetic Carbon ◽  
Effects Of Ph ◽  
Germination And Growth ◽  
Substrate Ph ◽  
Nutrient Conditions

Effects of pH, photoperiod, and substrate nutrient concentration on the rate of germination of the gemmae and primary protonema growth of Calymperes erosum C. Muell. were studied. There was a statistically significant difference in germination of C. erosum gemmae and protonema growth among the different substrate pH levels, photoperiod treatments, and substrate nutrient conditions, respectively (P<0.01). Gemmae germination and protonemal growth peaked at pH 4 and 5. Protonemal growth was retarded at pH 2, 3, 6, and 7. No germination was observed in continuous darkness. Germination and protonema growth increased significantly (P<0.01) within the first 3 and 6 hours of daylight but not again until after 9 and 12 hours of exposure, respectively. No statistical (P>0.05) increase in germination and protonemal growth was observed when the nutrient concentration was increased from 25% to 200%. Results indicate the moss is adapted to low nutrients and that it may germinate well at substrate pH as low as 2 howbeit the probability of establishment will remain limited until pH levels improve to 4 or 5. Furthermore, the moss is able to achieve net photosynthetic carbon gain during morning hours. Recovery from photoinhibition is likely by evening.

Nitrogen-addition effects on leaf traits and photosynthetic carbon gain of boreal forest understory shrubs

Oecologia ◽  
2014 ◽  
Vol 175 (2) ◽  
pp. 457-470 ◽  
Author(s):  
Sari Palmroth ◽  
Lisbet Holm Bach ◽  
Annika Nordin ◽  
Kristin Palmqvist
Keyword(s):  
Boreal Forest ◽  
Leaf Traits ◽  
Nitrogen Addition ◽  
Forest Understory ◽  
Carbon Gain ◽  
Photosynthetic Carbon ◽  
Understory Shrubs

scholarly journals Colchicine-induced mutation for new line development of tropical maize (Zea mays L.)

Food Research ◽  
2021 ◽  
Vol 5 (2) ◽  
pp. 298-307
Author(s):  
S.M. Rahajeng ◽  
A.N. Sugiharto ◽  
T. Wardayati
Keyword(s):  
Sweet Corn ◽  
Dry Weight ◽  
Pure Line ◽  
Mutant Line ◽  
Rate Analysis ◽  
Yellow Corn ◽  
Significant Difference ◽  
Single Cross ◽  
Chromosomal Changes ◽  
Germination And Growth

This research aimed to identify colchicine-induced tropical Yellow Corn characters and their potential in superior traits development. Single cross was applied to colchicine mutant line with tester line, INOAXM2 yellow and white seeds, to observe and test the characters enrichment of colchicine mutant, while pure line tester of sweet corn (OP-SBX) was used to observe the enhancement of germination and growth rate. Analysis of various quantitative data was determined using F test at the level of 5%, continued with Least Significant Difference Test (LSD) at the level of 5%. Potential characters and its inheritance pattern were determined by a descriptive statistical approach. Overall, germination and growth test of mutant show significant improvement when mutant crossed with tester lines. According to qualitative characters analysis of mutant line and its single way, it is found that glum colour is influenced by the male parent (Paternal Effect), while seed colour is determined by the female (Maternal Effect). From mutant M1 to M4, quantitative mutant (INFM) characters showed significant differences between lines within one generation and revealed improvements in single cross progeny. Single cross between colchicine line and tester mutant (IONAXM2) presents significant differences in all cobs characters (cob length, number of seeds in a row, number of rows, cob dry weight, and weight of 100 seeds (g) and reveals higher value compared to other lines. Mid-parent heterosis of single cross progeny of mutants was high for cob dry weight, those were 202.38% and 166.67%. The chromosomes observation of pink and yellow seeds of colchicine mutants revealed the presence of diploid, triploid, and euploid chromosomes, which verify chromosomal changes inside colchicine mutant lines.

Increased high‐latitude photosynthetic carbon gain offset by respiration carbon loss during an anomalous warm winter to spring transition

2019 ◽  
Vol 26 (2) ◽  
pp. 682-696 ◽  
Author(s):  
Zhihua Liu ◽  
John S. Kimball ◽  
Nicholas C. Parazoo ◽  
Ashley P. Ballantyne ◽  
Wen J. Wang ◽  
...  
Keyword(s):  
High Latitude ◽  
Carbon Gain ◽  
Carbon Loss ◽  
Warm Winter ◽  
Spring Transition ◽  
Photosynthetic Carbon

Response of photosynthetic carbon gain to ecosystem retrogression of vascular plants and mosses in the boreal forest

Oecologia ◽  
2012 ◽  
Vol 169 (3) ◽  
pp. 661-672 ◽  
Author(s):  
Sheel Bansal ◽  
Marie-Charlotte Nilsson ◽  
David A. Wardle
Keyword(s):  
Boreal Forest ◽  
Vascular Plants ◽  
Carbon Gain ◽  
Photosynthetic Carbon

Leaf- and plant-level carbon gain in yellow birch, sugar maple, and beech seedlings from contrasting forest light environments

2000 ◽  
Vol 30 (3) ◽  
pp. 390-404 ◽  
Author(s):  
Marilou Beaudet ◽  
Christian Messier ◽  
David W Hilbert ◽  
Ernest Lo ◽  
Zhang M Wang ◽  
...  
Keyword(s):  
Acer Saccharum ◽  
Sugar Maple ◽  
Light Availability ◽  
Fagus Grandifolia ◽  
Carbon Gain ◽  
Betula Alleghaniensis ◽  
Yellow Birch ◽  
Significant Difference ◽  
Leaf Level ◽  
Plant Level

Leaf-level photosynthetic-light response and plant-level daily carbon gain were estimated for seedlings of moderately shade-tolerant yellow birch (Betula alleghaniensis Britton) and shade-tolerant sugar maple (Acer saccharum Marsh.) and beech (Fagus grandifolia Ehrh.) growing in gaps and under a closed canopy in a sugar maple stand at Duchesnay, Que. All three species had a higher photosynthetic capacity (Amax) in the gaps than in shade, but yellow birch and beech responded more markedly than sugar maple to the increase in light availability. The high degree of plasticity observed in beech suggests that the prediction that photosynthetic plasticity should decrease with increasing shade tolerance may not hold when comparisons are made among a few late-successional species. Unit-area daily carbon gain (CA) was significantly higher in the gaps than in shade for all three species, but no significant difference was observed between light environments for plant-level carbon gain (CW). In shade, we found no difference of CA and CW among species. In gaps, beech had a significantly higher CA than sugar maple but similar to that of birch, and birch had a significantly higher CW than maple but similar to that of beech. Sugar maple consistently had lower carbon gains than yellow birch and beech but is nevertheless the dominant species at our study site. These results indicate that although plant-level carbon gain is presumably more closely related to growth and survival of a species than leaf-level photosynthesis, it is still many steps removed from the ecological success of a species.

scholarly journals Over-expressing the C3 photosynthesis cycle enzyme Sedoheptulose-1-7 Bisphosphatase improves photosynthetic carbon gain and yield under fully open air CO2 fumigation (FACE)

2011 ◽  
Vol 11 (1) ◽  
pp. 123 ◽  
Author(s):  
David M Rosenthal ◽  
Anna M Locke ◽  
Mahdi Khozaei ◽  
Christine A Raines ◽  
Stephen P Long ◽  
...  
Keyword(s):  
Carbon Gain ◽  
Cycle Enzyme ◽  
Photosynthetic Carbon ◽  
C3 Photosynthesis

scholarly journals The strategies of water–carbon regulation of plants in a subtropical primary forest on karst soils in China

2018 ◽  
Vol 15 (13) ◽  
pp. 4193-4203 ◽  
Author(s):  
Jing Wang ◽  
Xuefa Wen ◽  
Xinyu Zhang ◽  
Shenggong Li
Keyword(s):  
Plant Species ◽  
Life Forms ◽  
Carbon Gain ◽  
Primary Forest ◽  
Response Curves ◽  
Carboxylase Activity ◽  
Carbon Regulation ◽  
Intrinsic Water Use Efficiency ◽  
Significant Difference ◽  
The Impact

Abstract. Coexisting plant species in a karst ecosystem may use diverse strategies of trade off between carbon gain and water loss to adopt to the low soil nutrient and low water availability conditions. An understanding of the impact of CO2 diffusion and maximum carboxylase activity of Rubisco (Vcmax) on the light-saturated net photosynthesis (A) and intrinsic water use efficiency (iWUE) can provide insight into physiological strategies of the water–carbon regulation of coexisting plant species used in adaptation to karst environments at the leaf scale. We selected 63 dominant species (across 6 life forms) in a subtropical karst primary forest in southwestern China, measured their CO2 response curves, and calculated the corresponding stomatal conductance to CO2 (gs), mesophyll conductance to CO2 (gm), and Vcmax. The results showed that gs and gm varied about 7.6- and 34.5-fold, respectively, and that gs was positively related to gm. The contribution of gm to the leaf CO2 gradient was similar to that of gs. gs ∕ A, gm ∕ A and gt ∕ A was negatively related to Vcmax ∕ A. The relative limitations of gs (ls), gm (lm), and Vcmax (lb) to A for the whole group (combined six life forms) were significantly different from each other (P < 0.05). lm was the largest (0.38 ± 0.12), followed by lb (0.34 ± 0.14), and ls (0.28 ± 0.07). No significant difference was found between ls, lm, and lb for trees and tree/shrubs, while lm was the largest, followed by lb and ls for shrubs, grasses, vines and ferns (P < 0.05). iWUE varied about 3-fold (from 29.52 to 88.92 µmol CO2 mol−1 H2O) across all species, and was significantly correlated with gs, Vcmax, gm ∕ gs, and Vcmax ∕ gs. These results indicated that karst plants maintained relatively high A and low iWUE through the covariation of gs, gm, and Vcmax as an adaptation to a karst environment.

Studies on the Bionomics of the Case-bearing Clothes Moth, Tinea pellionella (L.)

1956 ◽  
Vol 47 (1) ◽  
pp. 167-182 ◽  
Author(s):  
P. S. Cheema
Keyword(s):  
Larval Development ◽  
Incubation Period ◽  
Wide Distribution ◽  
Effect Of Temperature ◽  
Continuous Darkness ◽  
Significant Difference ◽  
Temperature And Humidity ◽  
Important Pest ◽  
Orange G ◽  
Extent Of Damage

Tinea pellionella (L.), commonly known as the Case-bearing Clothes Moth or Fur Moth, is of world-wide distribution and is of considerable economic importance. It has been recorded on a variety of substances, particularly those of a keratinous nature. In India, it has been found as an important pest of woollen textiles. Its life-history and habits have been systematically investigated at different levels of temperature and humidity.The incubation period is 4 to 5, 5, 6 to 7 and 6 to 7 days at 21·5, 25, 30 and 32·5°C., respectively. Temperatures higher than 32·5°C. have been found lethal to eggs. Humidity has no effect on the incubation period. Percentage viability of eggs is greater at lower than at higher temperatures.Both temperature and humidity have been found to influence the larval development and the number of larval instars. Irrespective of temperature, higher humidities favour shorter larval development and the shortest larval period is at 25°C. and 90 per cent. R.H.Woollen materials impregnated with yeast are more suited for the larval development than those not so treated. Larvae do not exhibit colour preference. Woollen fabrics dyed with Cloth fast orange G 4 per cent, manufactured by “ Ciba ”, however, inhibit the growth of freshly hatched larvae.The behaviour of the larvae to direct sunlight has been studied. The rôle of (a) diffused light alternated with darkness, (b) darkness, (c) temperature and (d) humidity on the extent of damage caused by the larvae has been investigated. Under the conditions of the experiments, the amount of damage in continuous darkness was significantly greater than in alternating light and darkness, and that at 90 per cent. R.H. significantly greater than at 30 per cent., but there was no significant difference in the amount of damage at 27·5° and 32·5°C., respectively, and 90 per cent. R.H.The mode of pupation has been described. The pupal period has been studied and found.to occupy 18 ± 0·4, 10·3 ± 0·16 and 10·3 ± 0·33 days at 21·5, 25 and 30°C. and 90 per cent. R.H., respectively. Humidity has no effect on this period.The effect of temperature and humidity on (a) the preoviposition, oviposition and postoviposition periods and (b) number of eggs laid by a female has been studied. The life-span of the male and female, the relationship between the weight of the female at emergence and fecundity (which was highly significant) on the one hand and length of life (which was not significant) on the other has also been investigated. Sex ratio between females and males has been found to be 2·6:1. Three to four generations in a year have been recorded at 26 ± 8·0°C. and 82 ± 10 per cent. R.H. when the larvae are fed on woollen fabrics impregnated with yeast.

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