A mating design,including full-sib and half-sib Catalpa bungei was conducted.The germination ability was studied.The temperature,soaking and lighting time and pretreatment that could influence on Catalpa bungei seed g...A mating design,including full-sib and half-sib Catalpa bungei was conducted.The germination ability was studied.The temperature,soaking and lighting time and pretreatment that could influence on Catalpa bungei seed germination were studied.The result showed that the difference of germination rate and energy among different mating combinations was extremely significant.The influence of the individual plant to the germination rate was lower than that of different variety.The germination rate of the combination C.bungei and C.fargesii was always low.The germination rate and energy of two set of reciprocal crosses were very similar.The germination rate was the highest for soaking the seed for 24 hours at a constant temperature of 25 ℃ then germinating it at a changing temperature 20-30 ℃,the difference was remarkable.Another result,an 8-hour-long lighting daily was more advantaged for the germination of the seed than that in a completely dark condition;the germinating rate of the seed stored at a temperature of 5 ℃ for a week after soaking is also much higher than that stored at a low temperature.展开更多
In order to study the growth traits of Catalpa bungei clones in various growth periods during the nursery stage so as to provide a theoretical basis for genetic improvement,the authors matched the height and diameter ...In order to study the growth traits of Catalpa bungei clones in various growth periods during the nursery stage so as to provide a theoretical basis for genetic improvement,the authors matched the height and diameter in nursery stage by Logistic equation.The results showed that the mean height of clones was 325.19 cm,with the range of 253.48-402.88 cm,the mean basal diameter of clones was 4.29 cm,with the range of 3.61-5.05 cm.The height increment could be divided into two stage,i.e.the early-growing period and the fast-growing period,while the basal diameter increment could be divided into three stage,i.e.the early-growing period,the fast-growing period and the late-growing period.The beginning of fast-growing period,the end of fast-growing period,the duration of fast-growing period,and the daily mean height increment in fast-growing period were May 26-July 2,September 11-October 15,72-128 days,and 1.70-2.88 cm,while that for basal diameter increment were May 9-June 5,August 23-October 3,95-138 days,and 0.021-0.032 cm.The variation of traits in fast-growing period was more significant.The height and basal diameter were significantly correlated to their increments in earlygrowing period(0.744,0.928),fast-growing period(0.965,0.804),and their daily mean increment in fastgrowing period(0.733,0.811).展开更多
文摘A mating design,including full-sib and half-sib Catalpa bungei was conducted.The germination ability was studied.The temperature,soaking and lighting time and pretreatment that could influence on Catalpa bungei seed germination were studied.The result showed that the difference of germination rate and energy among different mating combinations was extremely significant.The influence of the individual plant to the germination rate was lower than that of different variety.The germination rate of the combination C.bungei and C.fargesii was always low.The germination rate and energy of two set of reciprocal crosses were very similar.The germination rate was the highest for soaking the seed for 24 hours at a constant temperature of 25 ℃ then germinating it at a changing temperature 20-30 ℃,the difference was remarkable.Another result,an 8-hour-long lighting daily was more advantaged for the germination of the seed than that in a completely dark condition;the germinating rate of the seed stored at a temperature of 5 ℃ for a week after soaking is also much higher than that stored at a low temperature.
文摘In order to study the growth traits of Catalpa bungei clones in various growth periods during the nursery stage so as to provide a theoretical basis for genetic improvement,the authors matched the height and diameter in nursery stage by Logistic equation.The results showed that the mean height of clones was 325.19 cm,with the range of 253.48-402.88 cm,the mean basal diameter of clones was 4.29 cm,with the range of 3.61-5.05 cm.The height increment could be divided into two stage,i.e.the early-growing period and the fast-growing period,while the basal diameter increment could be divided into three stage,i.e.the early-growing period,the fast-growing period and the late-growing period.The beginning of fast-growing period,the end of fast-growing period,the duration of fast-growing period,and the daily mean height increment in fast-growing period were May 26-July 2,September 11-October 15,72-128 days,and 1.70-2.88 cm,while that for basal diameter increment were May 9-June 5,August 23-October 3,95-138 days,and 0.021-0.032 cm.The variation of traits in fast-growing period was more significant.The height and basal diameter were significantly correlated to their increments in earlygrowing period(0.744,0.928),fast-growing period(0.965,0.804),and their daily mean increment in fastgrowing period(0.733,0.811).
