Productivity of mungbean (Vigna radiata) with elevated carbon dioxideat various phosphorus levels and cyanobacteria inoculation

Abstract

Increase in the concentration of atmospheric carbon dioxide (CO 2 ) has significant impact on crop growth and productivity. A study was undertaken during the kharif season of year 2014 to study the impacts of elevated CO 2 and cyanobacterial inoculation on growth and yield of mungbean crop under different doses of P using Free Air Carbon dioxide Enrichment (FACE) facility. The crop was grown under two CO 2 levels i.e., ambient (400 µmol mol -1 ) and elevated (550 ± 20 µmol mol -1 ), with five levels of P (0, 8, 12, 16 and 20 mg P kg -1 soil) and 2 levels of calothrix sp. (with and without cyanobacteria) inoculation. Elevated CO 2 level increased seed yield by 35.0% and biomass yield by 31.3%. Leaf area, photosynthesis rate and leaf chlorophyll content significantly increased at high CO 2 level. Yield attributes such as number of pods plant -1 , number of seeds pod -1 and test weight also increased at high CO 2 level. Application of P and cyanobacterial inoculation further increased growth and yield of the crop. The study showed that application of P as well as cyanobacteria could help in improving productivity of legumes under elevated CO 2 condition.

Physiological Response of Blackgram Varieties to Foliar Nutrition and Growth Regulators under Partial Shade in Coconut Orchard in Kerala

“…Foliar application of fertilizers and PGRs improved the vegetative growth of the plant which contributed to higher LAI and improved photosynthetic efficiency. These results are in accordance with the findings of Dey et al (2017) in mung bean. The higher leaf area index (LAI) observed in the plants could be attributed to the active role of auxins in promoting cell division and cell elongation.…”

Influence of cyanobacterial inoculants, elevated carbon dioxide, and temperature on plant and soil nitrogen in soybean

“…Cyanobacteria such as Anabaena laxa (RPAN8) and Calothrix elenkinii (RPC1) have been evaluated for their plant-growthpromoting and biocontrol potential and found promising in several legumes [12,27]. Earlier reports of increased yield and biomass accumulation in mungbean crops at elevated CO 2 levels, using cyanobacterial inoculation [28,29] support our hypothesis that similar beneficial changes may be observed in soybean. Cyanobacterial inoculation and nitrogen fixation can help in improving soil N status under changing climatic conditions.…”

Potential effects of a high CO2 future on leguminous species

“…Furthermore, while the fatty acid composition of legume seed oil, which has important implications for downstream applications and health properties, has been found to be significantly altered under e[CO 2 ] in a subset of studies (Hao et al, 2014 ; Heagle, Miller, & Pursley, 1998 ; Li et al, 2018 ), this has not always been the case (Rogers, Cure, & Smith, 1986 ; Thomas et al, 2003 ). Where differences have been noted, results have again been erratic, with both increases and decreases in the proportion of linolenic acid observed under e[CO 2 ] in soybean (Bellaloui et al, 2016 ; Hao et al, 2014 ; Li et al, 2018 ; Palacios et al, 2019 ), and increases in the percentage of omega‐3 fatty acids at the expense of omega‐6 fatty acids in mung bean (Dey et al, 2017 ), for example. As with other responses to e[CO 2 ], it is likely that cultivar‐ and species‐specific differences, as well as growth and environmental conditions, may play a role in these inconsistencies (Li et al, 2018 ).…”