Many tree planting programmes have long been initiated to increase forest cover to mitigate the effects of global climate change.Successful planting requires careful planning at the project level,including using suita...Many tree planting programmes have long been initiated to increase forest cover to mitigate the effects of global climate change.Successful planting requires careful planning at the project level,including using suitable species with favourable traits.However,there is a paucity of improvement data for tropical tree species.An experimental common garden of Shorea leprosula was established to study traits related to growth performance which are key factors in planting success.Seedlings of S.leprosula were collected from nine geographical forest reserves.To study the effects of genetic variation,seedlings were planted in a common environment following a randomized complete block design.From performance data collected 2017‒2019,one population showed the highest coefficient for relative height growth,significantly higher than most of the other populations.Interestingly,this population from Beserah also exhibited the lowest coefficient for scale insect infestation.This study provides preliminary results on growth performance and susceptibility to scale insect infestation in S.leprosula and the first common garden experiment site conducted on dipterocarp species.It lays a foundation for future genome-wide studies.展开更多
We studied seed germination and seedling growth performance in an economically and socially important fruit tree species <em>Vitellaria paradoxa</em> C.F. Gaertn. subsp. <em>nilotica</em> (shea...We studied seed germination and seedling growth performance in an economically and socially important fruit tree species <em>Vitellaria paradoxa</em> C.F. Gaertn. subsp. <em>nilotica</em> (shea tree) in Uganda. The study aimed at determining variations in germination among five shea tree seed provenances and seedling growth performance based on five growth traits (total height, root collar diameter, leaf length, leaf width and leaf petiole length). Five populations were considered from four agroecological zones comprising of 180 candidate “plus” trees. The seed trees consisted of 16 ethnovarieties selected based on their traits for fast growth and high oil yield. A total of 1,204 biological seeds were collected and sown in a tree nursery at Ngetta Zonal Agricultural Research and Development Institute during the month of June 2018 in a randomized incomplete block design with three replications. Significant variation (χ = 708;p < 0.01) was observed in seedling phenotypic traits within and between populations. Regression equation for height growth and leaf size index were given as y = 0.3787 + 12.671x and y = 0.6483 + 15.413x respectively. Root collar diameter was more correlated to leaf size index (0.425) than to height growth (0.30). Clustering of shea tree seedlings based on phenotypic growth traits revealed one aggregated cluster indicating that most of the seedlings from the five populations were similar (Jaccard index 0.92, p < 0.01). However, clustering based on SNP markers revealed three different populations. We recorded higher growth (χ = 708;p < 0.001) in Arua shea population. Red seeded;thin pulped and hairy fruited shea tree ethnovarieties recorded faster growth than the rest. The results reveal useful traits in selection for tree growth and further identified shea tree ethnovarieties that could be selected for fast growth.展开更多
研究被进行从象根那样的不同部分检测水摘录的效果，吠叫，分叉并且长叶，在二树种之间的成年落叶松， Larix gmelini，核桃树长果核桃树的生长上的树， Juglans mandshurica，幼苗和他感酌。四集中(100g · k g^(-1), 50 g · ...研究被进行从象根那样的不同部分检测水摘录的效果，吠叫，分叉并且长叶，在二树种之间的成年落叶松， Larix gmelini，核桃树长果核桃树的生长上的树， Juglans mandshurica，幼苗和他感酌。四集中(100g · k g^(-1), 50 g · k g^(-1), 25 g · k g^(-1) 和 12.5 g · k g^(-1)) 为每种摘录作好准备。结果证明有低、中等的集中的水摘录加速了领子直径的生长并且增加了生物资源和核桃幼苗的根 / 射击比率。水从树枝提取并且与低、中等的集中吠叫加速了幼苗的高度生长，当那些稍微从叶子和根减少了时幼苗的高度生长。水的申请落叶松提取的事实可能改进了核桃树长果核桃树属性的生长到在二树种之间的他感酌。展开更多
基金supported by the Government of Malaysia under the 10th and 11th Malaysia Plan.
文摘Many tree planting programmes have long been initiated to increase forest cover to mitigate the effects of global climate change.Successful planting requires careful planning at the project level,including using suitable species with favourable traits.However,there is a paucity of improvement data for tropical tree species.An experimental common garden of Shorea leprosula was established to study traits related to growth performance which are key factors in planting success.Seedlings of S.leprosula were collected from nine geographical forest reserves.To study the effects of genetic variation,seedlings were planted in a common environment following a randomized complete block design.From performance data collected 2017‒2019,one population showed the highest coefficient for relative height growth,significantly higher than most of the other populations.Interestingly,this population from Beserah also exhibited the lowest coefficient for scale insect infestation.This study provides preliminary results on growth performance and susceptibility to scale insect infestation in S.leprosula and the first common garden experiment site conducted on dipterocarp species.It lays a foundation for future genome-wide studies.
文摘We studied seed germination and seedling growth performance in an economically and socially important fruit tree species <em>Vitellaria paradoxa</em> C.F. Gaertn. subsp. <em>nilotica</em> (shea tree) in Uganda. The study aimed at determining variations in germination among five shea tree seed provenances and seedling growth performance based on five growth traits (total height, root collar diameter, leaf length, leaf width and leaf petiole length). Five populations were considered from four agroecological zones comprising of 180 candidate “plus” trees. The seed trees consisted of 16 ethnovarieties selected based on their traits for fast growth and high oil yield. A total of 1,204 biological seeds were collected and sown in a tree nursery at Ngetta Zonal Agricultural Research and Development Institute during the month of June 2018 in a randomized incomplete block design with three replications. Significant variation (χ = 708;p < 0.01) was observed in seedling phenotypic traits within and between populations. Regression equation for height growth and leaf size index were given as y = 0.3787 + 12.671x and y = 0.6483 + 15.413x respectively. Root collar diameter was more correlated to leaf size index (0.425) than to height growth (0.30). Clustering of shea tree seedlings based on phenotypic growth traits revealed one aggregated cluster indicating that most of the seedlings from the five populations were similar (Jaccard index 0.92, p < 0.01). However, clustering based on SNP markers revealed three different populations. We recorded higher growth (χ = 708;p < 0.001) in Arua shea population. Red seeded;thin pulped and hairy fruited shea tree ethnovarieties recorded faster growth than the rest. The results reveal useful traits in selection for tree growth and further identified shea tree ethnovarieties that could be selected for fast growth.
基金This paper was supported by National Natural Science Foundation of China （No. 30400341） and Heilongjiang Provincial Science Foundation （No. C0320）Acknowledgement I thank Dr. YAN Xiu-feng for his help and guidance.
文摘研究被进行从象根那样的不同部分检测水摘录的效果，吠叫，分叉并且长叶，在二树种之间的成年落叶松， Larix gmelini，核桃树长果核桃树的生长上的树， Juglans mandshurica，幼苗和他感酌。四集中(100g · k g^(-1), 50 g · k g^(-1), 25 g · k g^(-1) 和 12.5 g · k g^(-1)) 为每种摘录作好准备。结果证明有低、中等的集中的水摘录加速了领子直径的生长并且增加了生物资源和核桃幼苗的根 / 射击比率。水从树枝提取并且与低、中等的集中吠叫加速了幼苗的高度生长，当那些稍微从叶子和根减少了时幼苗的高度生长。水的申请落叶松提取的事实可能改进了核桃树长果核桃树属性的生长到在二树种之间的他感酌。
