陆地棉中长绒杂种优势的研究

近年来,利用基因生物技术并结合常规育种对植物进行改良的研究,在创造新品种和新材料等领域发挥了重要作用。利用 Ti 质粒的 T—DNA 系统,应用于双子叶植物得到了一些抗虫、抗除草剂的植物。但由于农杆菌难以侵染单子叶植物,使 Ti 质粒系统在禾谷类作物改良上得到很大限制。为此发展了外源基因导入技术,即通过不同途径,把外源基因或 DNA 片段直

Study on Heterosis for Mid-long Staple Cotton

Reaserch on heterosis for cotton hybrids F_1 of two intraspecific mid-long staple lines(Gossypium hirsutum L.),one intraspecific hybrid F_1(G.hirsutum L.)and two inter- specific hybrid F_1(G.hirsutum L.,G.barbadense L.)were conducted in Beijing in 1991.The results showed that the mid-long staple hybrids were able to conbine the high lint yield and high fiber quality,the lint yield of the two hybrids excess the control Zhong Mian 12 for 6% and 3%.The fiber length.finess and strength remain the level of long ...