华南双季超级稻秧苗理想形态性状研究

对华南稻区不同类型超级稻早、晚季秧苗期的形态特性作了比较研究，结果表明，在华南稻区早、晚季生态环境下，供试材料间植株高度、主茎叶片数、单株茎数、叶鞘基部宽度的差异均达极显著水平．这些性状可作为华南双季超级稻动态株型育种中秧苗期(早季30d、晚季18d)理想形态性状指标，即：早、晚季植株高度分别为35．0～37．5cm、33．5～35．5cm；早、晚季单株茎蘖数分别为2．0～3．0、3．0～3．2条／株，早、晚季主茎叶片数分别为5．8和4．9片，早、晚季叶鞘基部宽分别为0．71和0．51～0．54cm．

Ideal morphological characteristics of South China double cropping super rice seedling

A comparative study of the morphological characters of seedlings was made for the different types of super rice varieties, both in the early and late crop. The results showed that, under the ecological conditions of double rice cropping system in the southern China, a significant difference of F-value at 1% level existed among plant height, leaf number of main stem, stem number each plant and basal width of leaf sheath in the tested varieties. According to the results, the ideal morphological characteristics of South-China double cropping super-rice at the seedling stage were determined. They are 35.0-37.5 cm in the early crop and 33.5-35.5 cm in the late crop for the ideal plant height, 2.0-3.0 in the early crop and 3.0-3.2 in the late crop for the tillers per plant, 5.8 leaves in the early crop and 4.9 leaves in the late crop on the main stem, 0.71 cm in the early crop and 0.51-0.54 cm in the late crop for the width of basal leaf sheath.