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作者于1982～1994年对37个杂交水稻组合和杂交制种亲本品种的观察结果表明:杂交水稻植株外观形态特征双零叶、葫芦叶和伸长叶枕距是判断杂交水稻最后3片叶的依据。在最后3片叶生长期间,4个伸长节间的杂交组合和杂交制种母本品种,出现双零叶、2片葫芦叶和3个伸长叶枕距;5个伸长节间的杂交组合和制种父本品种,出现3片葫芦叶和4个伸长叶枕距;6个伸长节间的杂交组合和制种父本品种,伴随最后4片叶生长出现4片葫芦叶和5个伸长叶枕距。
The results of observation on 37 hybrid rice combinations and their hybrid parental varieties from 1982 to 1994 showed that the morphological characteristics of hybrid rice plants are the basis for judging the last three leaves of hybrid rice . During the last three leaf growth periods, four combinations of elongate internodes and hybrid parent varieties appeared, with double zero leaves, two cucurbits and three elongate leaf septums. Five elongate internodes Hybrid combinations and seed parenting varieties, there were 3 cucurbits and 4 elongate leaves; 6 combinations of elongate internodes and seed parents, 4 cucurbits with the last 4 leaves And 5 extend the leaf pillow distance.