High temperature at flowering inhibits swelling of pollen grains, a driving force for thecae dehiscence in rice (Oryza sativa L.)
High temperature at flowering inhibits swelling of pollen grains, a driving force for thecae dehiscence in rice (Oryza sativa L.)
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DOI：
10.1626/pps.3.430
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发表时间：
2000-12-01
影响因子：
2.5
通讯作者：
Horie, Takeshi
中科院分区：
文献类型：
--
作者：
Matsui, Tsutomu;Omasa, Kenji;Horie, Takeshi
为了阐明高温诱导水稻小花不育的机理，我们研究了开花时高温对囊裂开能力和引起囊裂开的花粉粒膨胀的影响。两个粳稻品种，在4个L盆中，在淹水土壤条件下，在开花期连续三天从10：00到16：00经受高温（39 ℃）和中温（34 ℃）。通过去除外稃对小花进行人工开放，检测响应于人工开放的囊裂开的百分比和在人工开放后4分钟期间测量的花粉粒的平均直径，以分别确定囊裂开的能力和花粉粒膨胀的能力。开花当天的高温处理降低了花粉囊的开裂率和花粉粒的直径，但不影响二者之间的关系。开花前1 ~ 2天高温处理的植株，花粉粒直径相同时，其花粉囊开裂率低于开花当天处理的植株。我们的结论是，在开花当天的高温降低了花粉粒膨胀的能力，导致穷人的囊开裂，而且，除了这种减少，高温给予开花前几天降低了功能的囊本身开裂，导致穷人的囊开裂。
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 (39degreeC) and moderate (34degreeC) 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.