PJB-2018-1100
Salix viminalis males maintain higher photosynthetic capacity than females under high temperature stress
Fei-Fei Zhai, Yun-Xing Zhang, Hai-Dong Li, Jin-Mei Mao, Zhen-Jian Li, Jun-Xiang Liu, Yong-Qiang Qian, Lei Han and Zhen-Yuan Sun
Abstract
Sexual-specific photosynthetic responses to high temperature stress were investigated in the dioecious species, Salix viminalis. The males and females of S. viminalis were cultivated for 7 weeks in greenhouse, afterwards they were processed to high temperature in climate box. Half of the plants were exposed to 40oC/30oC (day/night temperature) which increased stepwise (5oC every 48 h), while the other half were maintained at 25oC /15oC served as a control. Seven days later, photosynthetic physiological parameters in leaves of S. viminalis were analysed. The high temperature treatment caused significant reduction of net photosynthetic rate (PN) in S. viminalis, but male plants showed obviously higher PN than female plants. The Fv/Fm value was relatively stable and no obvious difference was detected between male and female plants, indicating the photosynthetic light reaction was not inhabited and both male and female plants possess functional PS II under high temperature. In photosynthetic carbon cycle, the activity of Rubisco declined and the higher activity of the enzyme in males than females revealed that inhibition of photosysthesis occurred and the photosysthesis in males were less inhibited under high temperature. In addition, Carotenoids (Car) content increased and the content of male plants was higher than that of females, which stated that the high temperature could cause photoprotective response and the photoprotection ability were stronger for males. These findings suggest that male plants of S. viminalis could maintain higher photosynthetic capacity under high temperature stress, thus male plants should be selected when breeding heat-resistance species according to photosynthetic parameters.
To Cite this article:
Zhai, F.F., Y.X. Zhang, H.D. Li, J.M. Mao, Z.J. Li, J.X. Liu, Y.Q. Qian, L. Han and Z.Y. Sun. 2020. Salix viminalis males maintain higher photosynthetic capacity than females under high temperature stress. Pak. J. Bot., 52(6): DOI: http://dx.doi.org/10.30848/PJB2020-6(40)
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