棉属异源四倍体（亚洲棉×司笃克氏棉）的植物形态及农艺性状研究

THE BOTANICAL AND AGRONOMIC CHARACTERS OF NEW ALLOTETRAPLOID GERMPLASM OF GOSSYPIUM ARBOREUM×G.STOCKSII

合成的棉属异源四倍体（亚洲棉×司笃克氏棉）新种质植株形态特性一致，主要农艺性状稳定，结铃正常。单铃重０．５６～０．６５ｇ，衣分２０．８％～２１．６％，２．５％纤维跨距长度２３ｍｍ左右，比强３４．０～３４．９ｇ／ｔｅｘ，麦克隆值４．８～４．９。各世代每天经１０ｈ短日照处理后比自然光照条件下现蕾、开花提前７～１０ｄ，结铃性提高２～４倍，表明该种质对光照要求较迟钝，与陆地棉杂交易获得杂种，是一个新的种质材料。

The botanical and agronomic characteristics of a new allotetraploid synthesis from G.arboreum×G.stocksii were observed.All the measured characteristics were uniform and stable in different generations.The synthesis produced fertile progeny.The boll weight was 0.56～0.65 g and lint percent was 20.8～21.6 in the new alloteraploid. The 2.5% span length was 23.1～23.7mm,and fiber strength 34.0～34.9 g/tex,while the micronaire was 4.8～4.9.The budding and flowering.periods of the synthesis under treatment with 10 hours sunlight each day were 7～10 days earlier than under natural conditions.The synthesis treated with less sunlight increased the numbers of boll by 2～4 times.The result indicated that its respone to sunlight is not sensitive.The synthesis can cross with upland cotton very well.It was a new germplasm resource.