High Temperature at Flowering Inhibits Swelling of Pollen Grains, a Driving Force for Thecae Dehiscence in Rice (Oryza sativa L.)

By Tsutomu Matsui, Kenji Omasa, T. Horie. 2000

226 citations recorded by the source corpus.

Summary To clarify the mechanism of high temperature-induced floret sterility in rice (Oryza sativa L.), we studied the effects of high temperature at flowering on the ability of thecae to dehisce and on pollen-grain swelling which causes thecae dehiscence. Two japonica rice cultivars, grown in four L pots under submerged soil conditions were subjected to high (39°C) and moderate (34°C) temperatures from 10 : 00 to 16 : 00 for three consecutive days at the flowering stage. The percentage of the thecae dehisced in response to artificial opening of the florets by removing lemma and the mean diameter of the pollen grains measured during four minutes after the artificial opening were examined to determine the ability of the thecae to dehisce and that of the pollen grains to swell, respectively. The high temperature given on the day of flowering decreased both the percentage of the dehisced thecae and the diameter of the pollen grains but did not affect the relationship between them. The thecae of the plants which had been subjected to the high temperature for one or two days before flowering, however, showed a lower dehiscence percentage than those of the plant treated on the day of flowering against the same pollen-grain diameter. We concluded that high temperature given on the day of flowering decreased the ability of the pollen grains to swell resulting in poor thecae dehiscence, and that, besides this decrease, high temperature given just before the days of flowering lowered the function of thecae themselves to dehisce, causing poorer thecae dehiscence.

Subfields: Plant Science

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Citations in the corpus

Correlation between Viability of Pollination and Length of Basal Dehiscence of the Theca in Rice undera Hot-and-Humid Condition (2005, background): “This was caused by the indehiscence of thecae and the delay of pollen release, and a decrease in the percentage of germinated pollen grains deposited on the stigmata (Satake and Yoshida, 1978; Matsui et al., 2000; Matsui et al., 2001b).”
Heat-Induced Floret Sterility of Hybrid Rice (Oryza sativa L.) Cultivars under Humid and Low Wind Conditionsin the Field of Jianghan Basin, China (2010, background): “High temperatures at the time of anthesis impede the swelling of pollen grains in the locules (Matsui et al., 2000) that is a driving force for anther dehiscence (Matsui et al., 1999a, 1999b), and this can result in indehiscence of anther (Matsui et al., 2000).”
Possible correlation between high temperature-induced floret sterility and endogenous levels of IAA, GAs and ABA in rice (Oryza sativa L.) (2007, background): “High temperature-tolerant cultivars exhibit higher floret fertility, fecundity and anther dehiscence than susceptible cultivars under the high temperature stress (Matsui et al. 2000, 2001; Satake and Yoshida 1978).”
Species, ecotype and cultivar differences in spikelet fertility and harvest index of rice in response to high temperature stress (2006, background): “Studies have shown that intraspecific variation in grain yield exists among cultivars of both indica and japonica types (Moya et al., 1998; Ziska et al., 1996; Matsui et al., 1997, 2000, 2001a) in response to high temperature.”
Impact of high-temperature stress on rice plant and its traits related to tolerance (2011, background): “Under severe high temperature, the swelling of the pollen grains is inhibited, which leads to indehiscence of the theca (Matsui et al. 2000), while moderately high temperatures usually result in failure of pollen release (Matsui et al. 2005).”
Spikelet Proteomic Response to Combined Water Deficit and Heat Stress in Rice (Oryza sativa cv. N22) (2011, background): “There is usually a quantitative relationship between spikelet fertility and the number of germinated pollen grains, with the critical number of germinated pollen on the stigma for normal fertility being between 10 and 20 (Matsui et al. 2000; Jagadish et al. 2010).”
High temperature stress and spikelet fertility in rice (Oryza sativa L.). (2007, background): “Although heat stress primarily affects anther dehiscence (Matsui et al., 2000, 2001; Prasad et al., 2006), it is possible that, in susceptible genotypes such as Azucena, that a number of other processes before fertilization are affected.”
Consequences of high temperature under changing climate optima for rice pollen characteristics-concepts and perspectives (2018, background): “…treatment applied at anthesis stage increased vapor pressure deficit thus enhanced evaporative losses from anther and thereby reduced moisture availability required for pollen grain swelling and subsequently affected anther dehiscence that is required for pollination (Matsui et al. 2000).”
High-Temperature Effects on Rice Growth, Yield, and Grain Quality (2011, background): “Pollination is sensitive to temperature: high temperatures at the time of flowering inhibit the swelling of pollen grains (Matsui et al., 2000), whereas low temperatures at the booting stage impede pollen growth (Shimazaki et al.”