The Study On Seed Germination Condition Of Keteleeria Fortunei Var. Cyclolepis

Keteleeria fortunei var.cyclolepis subjected Keteleeria,Pinaceae,which is an ideal species of tree for mountain afforestation,timber forest and landscaping endemic to China.Now,K.fortunei var.cyclolepis is in a vulnerable state,and its germplasm resources was serious loss by long-term human deforestation and the process of self-destruction.We will research the basic biological and germination characteristics of K.fortunei var.cyclolepis seeds to reveal the method of seed germination-accelerating and the effect of environmental factors on its germination,and discuss optimum germination conditions of K.fortunei var.cyclolepis.The main results were as follows.K.fortunei var.cyclolepis seed is oval,which is brown burnish in front and pale yellow in back.The middle or lower part of seed wing is more winder.Its thousand kernel weight was 127.05±4.08 g,seed length was 15.04±0.05 mm,seed width was 4.99±0.10 mm,seed length/seed width was 3.01±0.06,seed thick was 4.33±0.10 mm,moisture content was 14.29±0.87%,seed vigor was 67.6±1.67%,water absorption was 30%.The results of germination-accelerating experiment showed:gibberellin concentration was the main factor affecting K.fortunei var.cyclolepis seeds germination and seedling growth.The seeds germination and seedling growth ware best in the condition that 200 mg/L gibberellin solution and soaked 48 h at 30 ?,the germination rate of K.fortunei var.cyclolepis seed was 83.33%,germination vigor was 56.67%,germination value was 15.74,embryo length was 20.05 mm,and the radicle length was 41.35 mm.Among 5 temperature conditions,the effect of seed germination and seedling growth of K.fortunei var.cyclolepis was optimum at 25?,it's germination rate,germination potential,germination value,embryo length and radicle length were 83.33%,56.67%,15.74,20.05 mm and 41.35 mm,respectively.When the temperature was below 25?,the effect of seed germination was poor and seedling growth was slow;when the temperature was higher than 25?,seed germination and seedling growth were inhibited.There was no significant effect of light on the germination of K.fortunei var.cyclolepis seeds,the germination rate was 81.67%-83.33%,but,light had some effect on seedling growth.K.fortunei.var.cyclolepis seedlings were etiolated in condition of continuous darkness.Intermittent illumination had no significant effect on seed germination and seedling growth of K.fortunei var.cyclolepis.K.fortunei var.cyclolepis seeds could not germinated in 10%moisture conditions.In 25%-30%moisture conditions,the germination rate was the best,and the seed germination rate was 75.00%.When the moisture content in matrix was less than 25%,K.fortunei var.cyclolepis seeds could not germinate or had bad effect of germination and poor seedling growth,when the moisture content in matrix was greater than 30%,the seed germination and seedling growth were inhibited.The germination rate of K.fortunei var.cyclolepis seeds in the paper substrate was best,which was 83.33%,the seedling growth was fastest in the sand matrix,its plumule length was 22.42 mm and radicle length was 53.08 mm,thus the sand matrix was optimal in the practical application.Accordingly,the optimum seed germination conditions of K.fortunei var.cyclolepis:firstly,seeds soaked in 200 mg/L gibberellin solution with 48 h,at 30?,then,put them in the 25%-30%moisture content of sand matrix,with light or periodic light,at 25?.