The field study was conducted on six wild chickpea accessions to evaluate the influence of agroclimatic indices viz., accumulated growing degree days (GDD), photo-thermal unit (PTU) and heliothermal unit (PTU) at various phenophases of chickpea under irrigated and rainfed conditions on yield of the plant. C pinnatifidum 212 witnessed highest accumulation of heat units at all stages of phenophasic development under irrigated and rainfed conditions. Agroclimatic indices depicted positive correlation with yield under rainfed conditions.Path coefficient analysis revealed that under irrigated conditions, yield attributes and agroclimatic indices showed strong positive correlation towards the final grain yield, though HTU at maturity indirectly affected yield via pods per plant (PPP) to the final yield in rainfed treatment. Among all the accessions, C pinnatifidum 212 performed better than other accessions by possessing high heat use efficiency (HUE) values, thus displaying their capacity of utilizing GDD and incorporating final yield.
Six wild chickpea accessions were procured during Rabi seasons 2015-16 and 2016-17 seasons at Punjab Agricultural University, Ludhiana to record morpho-physiological parameters and yield components at pod initiation stage. The experiment was carried out in randomized block design with two treatments irrigated and rainfed each with three replicates. Results indicated a significant decrease in the specific leaf weight (SLW), photosynthetic rate (PR) and relative water content (RWC) under rainfed conditions in wild chickpea accessions. Wild accessions C judaicum 17148 (29.5%) and C pinnatifidum212 (31.0%)displayed their resistance towards water scarcity by maintaining high relative water content that depicted negative correlation with membrane damage (r=-0.98).The membrane damage showed an inversely proportional relationship (r=-0.69) with seed weight, a yield component under rainfed conditions evidencing the requirement of water at pod filling stage.
Basmati rice cultivators with longer internodes and shallow rooting system are prone to lodging especially during panicle development thus ultimately reducing yield, quality as well as efficiency of mechanical harvesting.Manipulation of GA status both via using exogenous application of GA or use of GA biosynthesis inhibitors or either by genetic alteration are regularly used to optimize plant growth and yields. Keeping this in mind the main objective of the study was to assess the role of Prohexadione-calcium (Pro-Ca) to reduce internode elongation against lodging stress without negatively affecting its productivity. A field experiment was conducted on three cultivars of basmati rice (Punjab Basmati 2, Punjab Basmati 3 and Pusa Basmati 1121) in split plot design at three concentration levels (foliar application) of Pro-Ca @5,10 and 20mg/l at vegetative and anthesis stage. Pro-Ca was found to uphill the concentrations of total chlorophyll (~9%)and Carotenoid(~4%) content in leaves at both vegetative and anthesis stages. An increment in the photosynthetic rate in flag leaf was also recorded in Pro-Ca treated sets in comparison to control, A significant increase in sucrose content in fully expanded leaf at vegetative and flag leaf at anthesis stage was recorded.Plant height significantly decreased in Pro-Ca treated plants and this decrease in height was recorded more with increased concentration of Pro-Ca. The increase in the yield contributing parameters viz., number of spikes/plant and grain/m2might be attributed to the blockage of gibberellins synthesis on account of Pro-Ca applicationin selected basmati rice variety PUSA 1121 by upregulating the photosynthetic rate (2%) andalso increase in sucrose content(2 to 18%).
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