Low temperature-induced sterility in rice: Evidence for the effects of temperature before panicle initiation
Low temperature-induced sterility in rice: Evidence for the effects of temperature before panicle initiation
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DOI：
10.1016/j.fcr.2006.11.010
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发表时间：
2007-03-05
影响因子：
5.8
通讯作者：
Arakawa, Ichiro
中科院分区：
文献类型：
--
作者：
Shimono, Hiroyuki;Okada, Masumi;Arakawa, Ichiro
水稻小穗不育性的研究这是粒子发育过程中温度较低的结果。然而，这一温度本身并不能完全解释田间观察到的不育性波动，因为水稻对低温的敏感性往往会在敏感期根据其生理状态而变化。在本研究中，我们研究了颗粒起始期(PI)之前的温度是否影响植株在穗部发育期间对不育的敏感性。为了验证这一点，我们进行了为期两年的盆栽研究，并使用冷却度数(CDD)模型对现场数据进行了分析。盆栽试验中，在PI前的营养生长期，分别控制3周的气温(T-a)和水温(T-w)。PI后，将植株浸入19.5摄氏度的冷水浴中，以诱导花朵不育。我们发现，营养生长期间较低的T-W显著增加了不育性。营养生长期的低T-a也显著增加了不育性，但即使在低T-a的情况下，这种影响也被温暖的T-w所减弱。营养生长期不育性与T-W呈密切负相关。在对田间数据的分析中，我们引入了CDD，使用低于20摄氏度的阈值水平来表示从PI到抽穗期的低温暴露程度。由于T-W数据的稀缺性，本研究采用T-a数据进行分析。CDD模型被应用于在日本北部四个典型的凉爽夏季(1980、1988、1993和2003年)从9个农业研究中心收集的77个独立的数据集。一个地点不育率的年际变化大致可以用CDD的变化来解释，但在不同年份之间观察到了很大的偏差。偏差与PI前30天的T-a平均值有关。在CDD水平相近的情况下，PI前T-a值越低，不孕症越严重。不孕症和CDD的部位间关系也有类似的偏差，这些偏差与PI前的T-a相关。这些结果表明，水稻植株在穗部发育过程中对低温的敏感性在PI之前的温度，尤其是T-W温度上发生变化。(C)2006爱思唯尔B.V.保留所有权利。
Spikelet sterility of rice (Oryza sativa L.) results from low temperatures during particle development. However, this temperature alone cannot fully explain the fluctuations in sterility observed in the field, since the susceptibility of rice plants to low temperature often changes according to its physiological status during sensitive stages. In the present study, we examined whether temperatures before the particle initiation stage (PI) influence the plant's susceptibility to sterility during panicle development. To test this, we conducted a 2-year pot study and an analysis of field data using a model of cooling degree-days (CDD). In the pot study, the air temperature (T-a) and water temperature (T-w) were controlled independently for 3 weeks during the vegetative growth stage before PI. After PI, the plants were submerged in a cool water bath at a critical temperature of 19.5 degrees C to induce floral sterility. We found that low T-w during vegetative growth significantly increased the sterility. Low T-a during vegetative growth also significantly increased the sterility, but this effect was diminished by warm T-w even at low T-a. There was a close and negative correlation between sterility and T-w during vegetative growth. In the analysis of field data, we introduced CDD using temperatures below a threshold level of 20 degrees C to represent the magnitude of the exposure to low temperature from PI to the heading stage. Data of T-a was used for this analysis because data of T-w was scare. The CDD model was applied to 77 independent data sets collected at nine Agricultural Research Centers during four typical cool summers (1980, 1988, 1993, and 2003) in northern Japan. Year-to-year variations in sterility at one site were roughly accounted for by the variations in CDD, but large deviations were observed among the years. The deviations were related to T-a averaged over the 30-day period before PI. For a similar level of CDD, the lower the T-a before PI, the greater the sterility. Similar deviations were observed in the between-site relationships between sterility and CDD, and these deviations were related with the T-a before PI. These results suggest that temperatures before PI, and especially T-w change the susceptibility of a rice plant to low temperatures during panicle development. (c) 2006 Elsevier B.V. All rights reserved.