Effect of high temperature and water stress on pollen germination and spikelet fertility in rice

    Rang, Z W and Jagadish, S V K and Zhou, Q M and Craufurd, P Q and Heuer, S (2011) Effect of high temperature and water stress on pollen germination and spikelet fertility in rice. Environmental and Experimental Botany, 70 (1). pp. 58-65. ISSN 0098-8472

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    Abstract

    In future climates, rice could more frequently be subjected to simultaneous high temperature and water stress during sensitive developmental stages such as flowering. In this study, five rice genotypes were exposed to high temperature, water stress and combined high temperature and water stress during flowering to quantify their response through spikelet fertility. Microscopic analyses revealed significant differences in anther dehiscence between treatments and genotypes, with a moderately high association with the number of germinated pollen grains on the stigma. There was a strong relationship between spikelet fertility and the number of germinated pollen on stigmas. Although, all three stress treatments resulted in spikelet sterility, high-temperature stress caused the highest sterility in all five genotypes. A cumulative linear decline in spikelet fertility with increasing duration of independent high-temperature stress and in combination with water stress was quantified. Better anther dehiscence, higher in vivo pollen germination, and higher spikelet fertility were observed in both the N22 accessions compared with IR64, Apo and Moroberekan under high temperature, water stress and combined stress, indicating its ability to tolerate multiple abiotic stresses.

    Item Type: Article
    Divisions: UNSPECIFIED
    CRP: UNSPECIFIED
    Uncontrolled Keywords: Anthesis; High temperature; Pollen germination; Rice; Spikelet fertility; Water stress
    Subjects: Others > Agriculture-Farming, Production, Technology, Economics
    Depositing User: Mr Siva Shankar
    Date Deposited: 20 Feb 2014 05:01
    Last Modified: 20 Feb 2014 05:01
    URI: http://oar.icrisat.org/id/eprint/7540
    Official URL: http://dx.doi.org/10.1016/j.envexpbot.2010.08.009
    Projects: Cereal System Initiative for South Asia(CSISA)
    Funders: China Scholarship Council(CSC)
    Acknowledgement: UNSPECIFIED
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