Possible correlation between high temperature-induced floret sterility and endogenous levels of IAA,GAs and ABA in rice (<Emphasis Type="Italic">Oryza sativa</Emphasis> L.) |
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Authors: | Ri-Sheng Tang Jian-Chu Zheng Zhi-Qing Jin Da-Dong Zhang Yi-Hong Huang Liu-Gen Chen |
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Affiliation: | (1) Institute of Agrobiological Genetics and Physiology, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, P.R. China;(2) Institute of Agricultural Resource and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, P.R. China |
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Abstract: | In order to explore the possible physiological mechanism of high temperature induced sterility in rice, we examined the floret
sterility and endogenous plant growth regulator contents in pollens of two hybrid rice cultivars Shanyou63 and Teyou559 that
are tolerant and susceptible to high temperature, respectively. Indexes of floret sterility, pollen activity, and variation
of endogenous indole-3-acetic acid (IAA), gibberellic acids (GAs), abscisic acid (ABA), free proline and soluble proteins
in anthers were measured. We found that during the course of high temperature treatment, both cultivars exhibited a marked
decrease in pollen activity, pollen germination and floret fertility; however, the high temperature tolerant Shanyou63 showed
a much slower rate of decrease than the high temperature susceptible Teyou559. In addition, anthers of both cultivars displayed
a decrease in the contents of IAA, GAs, free proline and soluble proteins but an increase in the ABA content. Yet compared
to Teyou559, Shanyou63 retained significantly higher levels of free praline and GAs and a lower level of ABA, along with higher
pollen vigour and pollen germination rate even after prolonged high temperature treatment. Our study suggests a possible correlation
between pollen viability/floret sterility and high temperature-caused changes in IAA, GAs, ABA, free proline and soluble protein
contents. The severity in these changes may reflect the variation of rice cultivars in their heat stress sensitivities for
floret development. |
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Keywords: | Endogenous hormones Floret sterility Free proline High-temperature stress Indica hybrid rice Soluble proteins |
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