影响十字花科自交不亲和系亲和指数的几个因素

Some Elements Affecting on Compatible lndex in Self-incompatible Line of Mustard Family

十字花科自交不亲和性的大小关系到杂交制种的纯度和原种的繁殖系数。本试验对表示自交不亲和性大小的自交结实指数的影响因素进行了探讨。结果表明：自交不亲和系植株的花期自交结实指数，随着植株上花枝部位的不同而有差异，一般中、下部的花枝低而稳定，上部的往往偏高且较不稳定。同时自交结实指数也因自交不亲和系植株的营养状况而不同，生长强壮的，其花期自交结实指数较稳定；生长不良的。其自交结实指数不稳定。此外，自交不亲和系植株的自交结实指数也与花龄有关，花蕾期的自交结实指数高，其中以开花前２～４天的花蕾为最高；即将开还未开、初露花冠时，其自交结实指数也较高；开花之后随着逐渐衰败而降低至零。

The affinity of self-incompatibility in the mustard family affects the purity of hybrid seed and the propagation coefficient of stock plant.The result showed that the different positions of the flower-ing branch caused different affinity index.Generally,the fruiting index of self-crossing was low and sta-ble at the middle and lower branchs of plant and high at the upper branchs. It was also affeted by its nutritional conditions. There were low and stable index in the vigorous plants,otjerwise,it was gigh.Besides,it was affected by the flowering age. The index was high during the bud stage of the flowering,the highest index appeared in 2-4 days before flowering.Afterwards,it reduced gradually to zero in the stage of flower desclinning.