Physiological traits for high temperature stress tolerance in Brassica juncea

Abstract

Temperature stress is one of the major limitations to crop productivity worldwide. Identifying suitable screening indices and quantifiable traits would facilitate the crop improvement process for high temperature tolerance. The objective of the present study was to screen and to identify temperature tolerant Brassica genotypes on the basis of physiological parameters viz. relative water content (RWC), total chlorophyll content, membrane stability index (MSI), total carotenoid content and yield. Fifteen Brassica juncea genotypes subjected to temperature stress by growing the crops at three dates of sowing i.e. 15th October (D 1 ), 1st November (D 2 ) and 15th November (D 3 ); showed decrease in RWC, MSI and chlorophyll content at D 2 and D 3 sowings compared to the D 1 . Genotypes like Proagro, NDR 8801 and CS-52 showed lower decline in MSI, RWC, chlorophyll and carotenoid content in leaves and seed yield/plant, while Pusa Agrani, EJ-15 and Pusa Tarak showed comparatively greater decline in the above parameters. The results suggest that physiological parameters like MSI, RWC and chlorophyll and carotenoid contents can be used as simple indices for screening and identifying temperature stress tolerant genotypes.

Physiological Attributes for Screening of Indian mustard (Brassica juncea L. Czern and Coss) Genotypes during Terminal Heat Stress

“…Our findings are in agreement with the earlier studies on Indian mustard by Ram et al, (2012) and Kumar et al, (2013). Electrolyte leakage ranged from 0.89% (PRO 5222) to 1.76 % (RGN 330) highest being in the susceptible genotypes.…”

“…Heat stress during the postanthesis (seed filling) negatively influences the movement of photosynthetic products to the developing sinks and inhibits the synthetic processes, thus lowering seed weight and seed yield and may alter seed quality (Bhullar and Jenner, 1985). A low reduction in the physiological parameters like MSI, RWC and chlorophyll are some of the simple indices for screening and identifying heat stress tolerant genotypes as also suggested by Kumar et al, (2013). The significant co-efficient of correlation between test weight (1000-seed weight) and physiological traits were observed (Fig.…”

Effect of sowing dates and nitrogen levels on total dry matter and its partitioning at different growth stages and yield of Indian mustard (Brassica juncea L.)

“…This has also increased the cell division and enlargement, which led to higher growth rate. Similar findings were recorded by Kumar et al, (2013).…”

Phenological and Growth Responses of Indian Mustard (Brassica juncea L.) Genotypes to Different Sowing Dates

“…In Haryana, rapeseed and mustard is one of the major growing crop occupying 0.56 million ha of area, with production and productivity of 0.699 million tones and 1248 kg/ha respectively (India stat 2014-15). Indian mustard is sown late due to delay in harvesting of rainy season crops like cluster bean, cotton and rice (Kumar et al, 2013).…”