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

▶ N22 an aus rice cultivar is a good high temperature and water deficit stress tolerant donor. ▶ High temperature at flowering stage results in cumulative linear decline in spikelet fertility. ▶ Physiology at flowering affected similarly with combined high temperature and water stress. In future cli...

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Bibliographic Details
Published in:Environmental and experimental botany 2011, Vol.70 (1), p.58-65
Main Authors: Rang, Z.W., Jagadish, S.V.K., Zhou, Q.M., Craufurd, P.Q., Heuer, S.
Format: Article
Language:English
Subjects:
abiotic stress
air temperature
anther dehiscence
anthers
Anthesis
Biological and medical sciences
Climate
developmental stages
drought
drought tolerance
flowering
Fundamental and applied biological sciences. Psychology
genetic variation
genotype
gynoecium
heat stress
heat tolerance
High temperature
inflorescences
Oryza sativa
plant fertility
pollen
Pollen germination
Rice
Spikelet fertility
Water stress
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Summary:▶ N22 an aus rice cultivar is a good high temperature and water deficit stress tolerant donor. ▶ High temperature at flowering stage results in cumulative linear decline in spikelet fertility. ▶ Physiology at flowering affected similarly with combined high temperature and water stress. 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.
ISSN:0098-8472
1873-7307
DOI:10.1016/j.envexpbot.2010.08.009