Exogenously Applied Plant Growth Regulators Affect Heat‐Stressed Rice Pollens
Shah Fahada b, Saddam Hussaina b c d, Shah Saude f, F. Khana b c d, Shah Hassang h, Amanullahi j, Wajid Nasimk l m n, Muhammad Saleem Arifi j, F. Wanga b, Jianliang Huanga b o p✉
- aNational Key Laboratory of Crop Genetic Improvement MOA Key Laboratory of Crop Ecophysiology and Farming System College of Plant Science and Technology Huazhong Agricultural University Wuhan Hubei China
- bNational Key Laboratory of Crop Genetic Improvement, MOA Key Laboratory of Crop Ecophysiology and Farming System, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, China
- cCollege of Resources and Environment Huazhong Agricultural University Wuhan Hubei China
- dCollege of Resources and Environment, Huazhong Agricultural University, Wuhan, Hubei, China
- eDepartment of Horticultural Northeast Agricultural University Harbin China
- fDepartment of Horticultural, Northeast Agricultural University, Harbin, China
- gDepartment of Agriculture Extension The University of Agriculture Peshawar Khyber Pakhtunkhwa Pakistan
- hDepartment of Agriculture Extension, The University of Agriculture, Peshawar, Khyber Pakhtunkhwa, Pakistan
- i
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Abstract
Abstract Increasing temperature due to global warming has emerged one of the gravest threats to rice production. This study examined the influence of high temperature and exogenously applied plant growth regulators on pollen fertility, anther dehiscence, pollen germination and metabolites synthesis in pollens of two rice cultivars (IR‐64 and Huanghuazhan (HHZ)). Plants were subjected to high day temperature (HDT), high night temperature (HNT) and control temperature (CT) in controlled growth chambers. Four different combinations of ascorbic acid (Vc), alpha‐tocopherol (Ve), brassinosteroids (Br), methyl jasmonates (MeJA) and triazoles (Tr) were used along with a nothing applied control. Our results depicted that high temperature severely reduced the pollen fertility, anther dehiscence, pollen retention, germination and metabolites synthesis in pollens of both rice cultivars. Nonetheless, exogenous application of various plant growth regulators assuaged the adverse effects of high temperature and Vc + Ve + MeJA + Br was found the best combination than the other treatments for every studied characteristic. The HNT posed more negative effects than the HDT. Variations were also apparent between cultivars and HHZ performed better than IR‐64 under high‐temperature stress, with higher pollen fertility, better anther dehiscence, and greater pollen retention and germination rates. The greater tolerance of HHZ to high temperature was related with the higher synthesis of metabolites in this cultivar.
TL;DRIt was depicted that high temperature severely reduced the pollen fertility, anther dehiscence, pollen retention, germination and metabolites synthesis in pollens of both rice cultivars, and exogenous application of various plant growth regulators assuaged the adverse effects of high temperature. (Semantic Scholar)