Abstract We examined changes in rice (Oryza sativa L.) floret sterility and pollination as a function of vertical position of florets in the canopy at anthesis in paddy fields to clarify the ideal panicle height. Flowering pot-grown rice plants were placed in the rice canopy at different heights to position their florets at different depths below the canopy surface. The percentage of floret sterility was approximated as Y = 0.000335 X12 + 0.0296 X1 – 0.0451 X2 + 0.0152 X1X2 – 0.0468 (R2 = 0.921), where Y is the logit-transformed floret sterility (%), X1 is floret depth at anthesis (cm), and X2 is wind speed above the canopy (m s–1). The percentage of florets with fewer than 20 pollen grains on the stigma after flowering was approximated well by Y = 0.000554 X12 – 0.235 X22 + 0.5346 (R2 = 0.892), where Y is the logit-transformed percentage. The floret sterility (%) was correlated with the percentage of florets with

中文翻译：

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水稻（Oryza sativa L.）授粉和受精对冠层内小花高度的依赖性

摘要 我们研究了水稻 (Oryza sativa L.) 小花不育和授粉的变化，这是稻田开花时冠层中小花垂直位置的函数，以阐明理想的穗高。盆栽开花的水稻植株被放置在不同高度的水稻冠层中，以将它们的小花放置在冠层表面以下的不同深度。小花不育的百分比近似为 Y = 0.000335 X12 + 0.0296 X1 – 0.0451 X2 + 0.0152 X1X2 – 0.0468 (R2 = 0.921)，其中 Y 是 logit 转换的小花，X1cm 不育深度 (%) )，X2 是冠层上方的风速 (ms–1)。开花后柱头上花粉粒少于 20 个的小花的百分比近似为 Y = 0.000554 X12 – 0.235 X22 + 0.5346 (R2 = 0.892)，其中 Y 是对数转换的百分比。