Реферат
An experiment was conducted with blackgram (Vigna mungo L. Hepper) cv T-9 in Open top chambers (OTCs) to assess the impact of moisture deficit and its interaction with two levels of CO2 (550ppm and 700ppm) on biomass and seed yield. At flowering stage moisture deficit was imposed by withholding irrigation. Both elevated CO2 levels improved the total biomass and the extent of improvement was 2.7% and 23.5% under irrigated conditions, while 9.0% and 26.1% under moisture stress conditions at 550ppm and 700ppm of CO2 respectively. Higher improvement in seed yield than biomass at both elevated CO2 levels was recorded and under irrigated condition the seed yield improved by 26.3% and 58.9% while under moisture deficit conditions by 9.0% and 34.7% at 550ppm and 700ppm respectively. Though moisture deficit reduced the total biomass, seed yield and HI at all CO2 levels, however the magnitude of reduction was less at elevated CO2 levels. The ameliorative effect of enhanced CO2 concentrations under moisture deficit condition was observed through better pod number in blackgram as compared with ambient control which reflected as higher seed yield.
Реферат
Correlation coefficient and path analysis studies were carried out with seventeen parents (fourteen lines and three testers) resulting 42 F1 crosses for fifteen yield contributing component characters. The phenotypic and genotypic correlation analysis revealed that seed yield was highly significantly and positively correlated with number of branches, number of clusters, number of pods per plant, number of seeds per plant pod weight, total biomass and also highly significantly and positively correlated among themselves. Path coefficient analysis for seed yield revealed that significant phenotypic and genotypic direct effect with seeds per plant, 100 seed weight, harvest index, pod weight and number of clusters per plant. Hence selection for these characters may be carried out in the field and lab for overall yield improvement in blackgram.
Реферат
Black gram (Vigna mungo (L.) Hepper) var. IC-282009 - a highly CO2 responsive genotype for biomass and seed yield was grown in Open top chambers (OTCs) under three levels of CO2 i.e. ambient (390 ppm) and two elevated levels 550ppm and 700ppm to assess photosynthetic acclimation to elevated CO2. Net photosynthetic rate (PN), change in leaf soluble protein profile and leaf carbohydrate constituents such as total soluble sugars, reducing sugars and starch content in leaves was quantified at all three CO2 concentrations. Photosynthetic rate was enhanced by 78% and 30% at flowering stage with 550ppm and 700ppm CO2 as compared with ambient control. It was also observed a higher accumulation of starch, total soluble sugars and reducing sugars in leaves at elevated CO2 levels. However, the leaf protein content recorded a decrease and altered the profile of ploy peptides with enhanced CO2 levels. At elevated CO2 concentrations significant differences were observed in ploy peptide profile at vegetative and flowering stages, the intensity of 260 kDa poly peptide increased at vegetative stage, whereas 72 kDa polypeptide increased at flowering stage, while 52 kDa poly peptide decreased at both stages. Enhanced CO2 concentrations improved the PN though certain polypeptides of leaf protein are down regulated and necessitate further experimentation to confirm their involvement in responsiveness of the selected black gram genotype.