PJB-2020-50
Alleviating responses of exogenous silicon and phosphorus for rice pollen to high-temperature stress
WANG Qiang
Abstract
Increasing temperature due to global warming became one of the gravest threats to rice production. The influence of high temperature and exogenously applied plant growth regulators on pollen fertility, anther dehiscence, pollen germination in pollens were examined with two rice cultivars [9311 and Huanghuazhan (HHZ)]. in controlled growth chambers. Temperature treatments included high daytime temperature (HT) and ambient temperature (AT). The fertilization treatments were control, silicon (Si) alone, P (KH2PO4) alone and Si+P. The results showed that high temperature severely reduced pollen fertility, anther dehiscence, pollen retention and pollen germination of both rice cultivars. Variations were also apparent between cultivars and the greater tolerance of HHZ to high temperature performed better than 9311 under high temperature, with higher pollen fertility, better anther dehiscence and greater pollen retention and germination rates. In both cultivars, the pollen of plants treated with Si+P were more resistant to heat induced stress. Further studies are needed to test the ability of Si+P to alleviate the effects of different abiotic stresses.
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