大茎野生种后代在甘蔗育种中的利用

选择有突出优良性状的几个大茎野生种后代作为甘蔗杂交亲本利用，结果表明：杂交后代表现早中熟或中晚熟、生长快、植株高、粗生耐旱、抗风力强、高产稳产、宿根性好。已从中选育出粤糖７９－１７７、粤糖８４－１６０、粤糖８６－３５３和粤糖８６－３６８等优良品种和品系。在所研究的大茎野生种后代亲本中，证实了崖城７３－２２６、Ｆ１７２是优良的父本，Ｆ１６０是优良的母本。在应用时，选择优缺点能够互补的当地栽培种或常用主要亲本与之杂交较易获得成功。ＰＴ４３－５２利用效果较差，应少用作亲本。Ｆ１５６、Ｆ１６９交配亲本少，定植实生苗数不多，育种效果尚难肯定，有待进一步研究。

Utilization of S. robustum Descendants in Sugarcane Breeding

A number of S. robustum descendants with excellent characters have been used as parents in cross and produced good prosenies with early-mid or mid-late maturity, fast growth, tall stalks, strong and wide adaptability, strong wind resistance, drought tolerance, high and steady yielding and good ratooning. From these progenies, some promising varieties, such as Yuetang 79-177, 84-160, 86-353 and 86-368 have been obtained. The studies have shown that Yacheng 73-226 and F172 are excellent male parent just as F 160 is excellent female parent. For better breeding effect, they should be crossed with local commercial varieties or commonly used parents which are mutually supplementary in characters;PT 43-52 is not good to be used as parent; F156 and F169 are used in crossing only a few times with limited seedling population, therefore their breeding effects are still uncertain and need further study.