美洲狼尾草与象草杂交中花期相遇的调节

美洲狼尾草Ｔｉｆｔ２３Ａ（Ｐｅｎｎｉｓｅｔｕｍａｍｅｒｃｕｎｕｍ以下简称２３Ａ）在适宜播期内主茎叶数一般为２５。出叶间隔２～４ｄ。出叶速度总体上依抽出顺序而温慢，其分蘖一期发生在５～７叶龄；拔节则发生在１４叶龄前后，幼穗分化与拔节基本同步，在杂交制种中，当母本２３Ａ拔节前对父本象草Ｎ５１（Ｐ．ｐｕｒｐｕｒｅｕｍ，以下简称Ｎ５１）进行３～４周，每日９ｈ的短日照处理，则父母本花期基本相遇。

THE REGULATION OF MEETING IN FLOWERING PERIOD FOR CROSSING PENNISETUM AMERCUNUM WITH P.PURPUREUM

Pennisetum amercunum ,Tift 23A, its numbers of leaves in main stems are 25 in the appropri-ate sowing period.There is a interval of two to four days between two leaves. The leafing rategradually slows down with the sequence of leaves. Its tillering takes place at 5 to 7 foliar age,butelongation stage about 14 foliar age. The elongation and the ear initiation occur basically simulta-neous.If the father plant,P.purpureum,N51,was treated by short day 9 hours per day for 3 to 4weeks before the mother plant, 23A, elongated in crossing,the father plant would meet themother in flowering stage.