DOI: 10.1101/493247Dec 11, 2018Paper

Upregulation of photosynthetic capacity and thylakoid membrane protein enhanced tolerance to heat stress in wucai (Brassica campestris L.)

BioRxiv : the Preprint Server for Biology
Yuan YujieChenggang Wang


The hot climate of southern China from late summer to early fall is one of the major factors limiting the yield and quality of wucai (Brassica campestris L.). Under high temperature stress, heat-tolerant cultivars presented moderate injury to the photosynthesic apparatus, less inhibition of photochemical activity, better osmotic adjustment and antioxidant defences capacity compared to heat-sensitive cultivars. To study the effects of high temperature on the growth and development of wucai, plants of WS-1 (heat-tolerant) and WS-6 (heat-sensitive) were exposed to four heat stress treatments in growth chambers for 3 days. Chloroplasts of two cultivars evaluated for photosynthetic characteristics, fatty acid composition and differentially expressed proteins of thylakoid membrane. Larger decreases in growth and photosynthetic parameters occurred under heat stress in WS-6, compared with WS-1. In addition, WS-6 showed an obviouse K point in O-J-I-P steps under extremely high temperature, which indicated OEC had been damaged. WS-1 showed higher of maximum quantum yield of primary PSII photochemistry, number of active reaction centres per cross section of PSII, average absorbed photon flux per cross section of PSII, maximum trapped exci...Continue Reading

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