Influence of timing of cross-versus self-pollination on self-incompatibility in Brussels sprout inbreds

Summary The impact of cross pollination 30 h, 4 h, and immediately prior to self-pollination, and self-pollination 2, 4, 8, 12, 24 and 30 h prior to cross-pollination was assessed for pollen tube number per style, seed number per siliqua, and proportion of self-seed (sibs) per siliqua, in two inbred lines of brussels sprout. Pollination procedure had a marked effect on the amount of sib-and hybrid seed produced. Cross pollination 30 h prior to self-pollination produced significantly greater numbers of sib progeny, as did self-pollination 8–12 h before cross pollination. Prior application of self pollen reduces the number of pollen tubes in the style. The results of this experiment suggest that self-incompatibility in brussels sprout could better be assessed by self-pollination with a subsequent cross pollination 8 h later, and the determination of amounts of sib and F₁ hybrid seed per siliqua.     

Effect of Ogura male-sterile cytoplasm on the performance of cabbage hybrid variety

Summary Cabbage hybrid seeds are commercially produced by means of self-incompatibility. This system may show some instability mainly under tropical conditions, where cytoplasmic male sterility can be an alternative approach for hybrid seeds production. However, cabbage hybrids holding Ogura male-sterile cytoplasm show some irregularities during development. By assessing some characteristics during the growing cycle of male-sterile cabbage hybrids and comparing them to genomic similar male-fertile ones and to the most common cabbage hybrid cultivated in Brazil, it was observed that the male-sterile hybrids had the same vigour, uniformity, number of leaves, resistance to Xanthomonas campestris pv. campestris, and earliness as their male-fertile counterparts and performed better than the commercial check hybrid for some of these characteristics. Although male-sterile hybrids showed yellowing of leaves, some parental combinations succeeded in overcoming or strongly reducing this cytoplasmic effect.Abbreviations dat days after transplanting - CMS Cytoplasmic Male Sterility - CNPH National Centre for Vegetable Crops Research     

新疆扁桃品种自交不亲和S-Rnases基因型的分析鉴定

[目的]利用特异性PCR扩增、DNA测序和生物信息学方法鉴定新疆扁桃品种的S-Rnases基因型,对新疆扁桃授粉品种配置、人工授粉、遗传改良以及栽培利用都具有重要的理论意义和实践价值.[方法]以新疆24个栽培扁桃品种的叶片为试材,选用目前蔷薇科通用的引物组合对扁桃叶片基因组DNA进行自交不亲和S-RNases基因特异性PCR扩增,克隆测序结果比对分析,综合进行S-Rnases基因型的鉴定.[结果]利用引物组合AmyC5R+AS1Ⅱ对24个新疆栽培扁桃品种的基因组DNA进行S-Rnases基因特异性PCR,共扩增出32条清晰可辨的片段,克隆测序后,通过DNAMAN多重序列比对,发现共包括11个核苷酸序列,大小分别为1 688 bp(Sn1)、1 404 bp(S19)、1 330 bp(S61)、1 222 bp(S24)、1 141 bp(S25)、1 087 bp(S17)、979 bp(S10)、785 bp(S63)、777 bp(S6)、690 bp(S50)、602 bp(S15).[结论]鉴定出了新疆扁桃品种的10个S-Rnases基因型,分别为阿买提(S15S17S63)、红宝石(S15S17)、莎舟(S15S17)、鹰嘴(S10 S24)、矮丰(Sn1S25)、扁石头(Sn1S25)、桃扁桃(S6Sn1)、开心果(S6S61)、双果(S63Sn1)、纸皮(S50S61).     

甘蓝型油菜自交不亲和保持系的选育及其利用潜力

选育自交不亲和系的保持系有望解决大量繁自交不亲和系的困难。通过对国外和国内50份材料对甘蓝型油菜自交不亲和系“271”,“SI1300”恢复性或保持性的研究。在中国甘蓝型油菜遗传资源中找到了SI系的保持系,并得到4个保持效果好的双低（低芥酸,低硫苷）材料,大部分材料能恢复自交不亲和特性,历而易于选育到优良杂交种,进一步的研究表明由保持系配制的单交和三交杂种都有一定的产量潜力,通过筛选适当的恢复系有望得到优良的自交不亲和杂种。