The endogenous GAs, ABA and IAA in the shoot apices of 8-year-old Chinese pines, flowered, non-flowered and non-flowered but treated with GA4/7 were analyzed by GC-MS-SIM.The results demonstrated that GA3 and GA9 leve...The endogenous GAs, ABA and IAA in the shoot apices of 8-year-old Chinese pines, flowered, non-flowered and non-flowered but treated with GA4/7 were analyzed by GC-MS-SIM.The results demonstrated that GA3 and GA9 levels were obviously higher in flowered plants than in non-flowered. A peak value of GA3 in flowered plants occurred after appearance of the earliest auxiliary bud primorda which had the possibility of transforming into male cone bud primordia and before the morphological initiation of male cone bud primordia. Exogenously applied GA4/7 could enhance the endogenous GA3 and GA9, this may benefit the promotion of male cone buds in Chinese pine. The relations among ex-ogenously applied GA4/7 endogenous GAs, ABA and IAA in the shoot apices, and the initiation of male cone bud are discussed.展开更多
The morphology of mature male cones was observed and the impact of climate was studied.The collecting days of mature pollen at Chun’an County,Zhejiang Province,was during the 3-5-days period from the end of Mach to t...The morphology of mature male cones was observed and the impact of climate was studied.The collecting days of mature pollen at Chun’an County,Zhejiang Province,was during the 3-5-days period from the end of Mach to the beginning of April in normal temperature years,which would be 3-5 days later in low temperature years and 3-5 days earlier in high temperature years.The male cones at lower elevation blossom 6-8 days earlier than those at the elevation of 120-550 m.Therefore,it is practical to prolong reasonably the collecting period of pollen.展开更多
基金The research was funded by the National Natural Science Foundation of China
文摘The endogenous GAs, ABA and IAA in the shoot apices of 8-year-old Chinese pines, flowered, non-flowered and non-flowered but treated with GA4/7 were analyzed by GC-MS-SIM.The results demonstrated that GA3 and GA9 levels were obviously higher in flowered plants than in non-flowered. A peak value of GA3 in flowered plants occurred after appearance of the earliest auxiliary bud primorda which had the possibility of transforming into male cone bud primordia and before the morphological initiation of male cone bud primordia. Exogenously applied GA4/7 could enhance the endogenous GA3 and GA9, this may benefit the promotion of male cone buds in Chinese pine. The relations among ex-ogenously applied GA4/7 endogenous GAs, ABA and IAA in the shoot apices, and the initiation of male cone bud are discussed.
文摘The morphology of mature male cones was observed and the impact of climate was studied.The collecting days of mature pollen at Chun’an County,Zhejiang Province,was during the 3-5-days period from the end of Mach to the beginning of April in normal temperature years,which would be 3-5 days later in low temperature years and 3-5 days earlier in high temperature years.The male cones at lower elevation blossom 6-8 days earlier than those at the elevation of 120-550 m.Therefore,it is practical to prolong reasonably the collecting period of pollen.
