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首页> 外文期刊>Euphytica >Genetic and histological characterization of a novel recessive genic male sterile line of Brassica napus derived from a cross with Capsella bursa - pastoris
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Genetic and histological characterization of a novel recessive genic male sterile line of Brassica napus derived from a cross with Capsella bursa - pastoris

机译：新型隐性基因型甘蓝型油菜雄性不育系的遗传和组织学特性鉴定，来源于与Cap菜的杂交-Pastoris

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摘要

In a previously made cross Brassica napus cv. Oro (2n = 38) × Capsella bursa-pastoris (2n = 4x = 32), one F1 hybrid with 2n = 38 was totally male sterile. The hybrid contained no complete chromosomes from C. bursa-pastoris, but some specific AFLP (amplified fragment length polymorphism) bands of C. bursa-pastoris were detected. The hybrid was morphologically quite similar to ‘Oro’ except for smaller flowers with rudimentary stamens but normal pistils, and showed good seed-set after pollination by ‘Oro’ and other B. napus cultivars. The fertility segregation ratios (3:1, 1:1) in its progenies indicated that the male sterility was controlled by a single recessive gene. In the pollen mother cells of the male sterile hybrid, chromosome pairing and segregation were normal. Histological sectioning of its anthers showed that the tapetum was multiple layers and was hypertrophic from the stage of sporogenic cells, and that the tetrads were compressed by the vacuolated and disaggregated tapetum and no mature pollen grains were formed in anther sacs, thus resulting in male sterility. The possible mechanisms for the production of the male sterile hybrid and its potential in breeding are discussed. Keywords Brassica napus - Capsella bursa-pastoris - Genic male sterility - Tapetum - AFLP
机译：在先前制作的十字型甘蓝型油菜中。 Oro（2n = 38）×荚Cap小Cap菜（2n = 4x = 32），其中一个2n = 38的F 1 杂种是完全不育的。该杂种不包含来自伯氏梭菌的完整染色体，但是检测到了伯氏梭菌的一些特定AFLP（扩增的片段长度多态性）条带。该杂种在形态上与“ Oro”非常相似，除了较小的花，具有基本的雄蕊，但雌蕊正常，并且在“ Oro”和其他甘蓝型油菜授粉后显示出良好的结实。子代的生育分离率（3：1、1：1）表明，雄性不育由单个隐性基因控制。在雄性不育杂种的花粉母细胞中，染色体配对和分离正常。其花药的组织学切片显示，绒毡层是多层的，从生孢子细胞的阶段开始肥大，并且四倍体被空泡化并分解的绒毡层压缩，在花药囊中没有形成成熟的花粉粒，从而导致雄性不育。讨论了产生雄性不育杂种的可能机制及其在育种中的潜力。甘蓝型油菜-Cap菜-男性不育-绒毡层-AFLP

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