Characteristics of Fruiting and Pollen Tube Growth of Apple Autotetraploid Cultivars Showing Self-compatibility
Characteristics of Fruiting and Pollen Tube Growth of Apple Autotetraploid Cultivars Showing Self-compatibility
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DOI：
10.2503/jjshs1.78.402
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发表时间：
2009-10-01
影响因子：
--
通讯作者：
Suzuki, Akira
中科院分区：
文献类型：
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作者：
Adachi, Yoshiteru;Komori, Sadao;Suzuki, Akira
苹果（Malus x domestica Borkh.）具有配子体自交不亲和性。一般来说，多倍体分裂配子体SI；然而，关于苹果的数据却很少。本研究收集了苹果同源四倍体品种和原二倍体品种多倍体突变体的自交亲和机制的基本资料。同源四倍体具有自育性，其花粉与具有两个s等位基因的二倍体品种雌蕊相容。然而，原二倍体品种的花粉与同源四倍体品种的雌蕊不相容。虽然同源四倍体品种的花粉诱导SC，但同源四倍体品种自交或在原二倍体品种雌蕊中作为花粉亲本时，结实率和种子数均低于亲和性二倍体杂交组合。同源四倍体品种的花粉管生长速度显著高于自交二倍体品种，但显著低于亲和性二倍体杂交组合。这些结果表明，苹果同源四倍体品种的花粉诱导了SC，但保持了部分不亲和性。
Apples (Malus x domestica Borkh.) have gametophytic self-incompatibility (SI). Generally, the polyploidy breaks down gametophytic SI; however, there is little data on apples. In this study, we collected basic data on the self-compatibility (SC) mechanism of apple autotetraploid cultivars and polyploid mutants of original diploid cultivars. The autotetraploids showed self-fertility, and their pollen was compatible with the pistils of their original diploid cultivars, which share two S-alleles. However, the original diploid cultivars' pollen was incompatible with the pistils of autotetraploid cultivars. Although the pollen of autotetraploid cultivars induced SC, the fruit set percentage and seed number were lower when autotetraploid cultivars were selfed or used as pollen parents in the pistils of the original diploid cultivars than in compatible diploid cross-combinations. The pollen tubes of autotetraploid cultivars grew significantly further than those of the selfed diploid cultivars, but grew significantly slower than in compatible diploid cross-combinations. These results show that the pollen of apple autotetraploid cultivars induced SC but maintained partial incompatibility.