With F1 of self pollinated Eucalyptus urophylla, F1 of inter tree pollinated E.urophylla, F1of open pollinated E.urophylla and F1 of E.urophylla×grandis as materials,inbreeding depression and hy...With F1 of self pollinated Eucalyptus urophylla, F1 of inter tree pollinated E.urophylla, F1of open pollinated E.urophylla and F1 of E.urophylla×grandis as materials,inbreeding depression and hybrid superiority in growth and wood traits are analyzed and discussed.The results are as follows.①There was a regularity for E.urophylla that F1 of self pollinated was subjected to more intense depression than F1 of open pollinated,and growth traits showed more signifcant depression than wood traits.②As to F1 of self pollinated E.urophylla, height,DBH and volume showed significant or extremely significant depression,while water content of green wood,wood density and bark thickness showed no significant depression.③As to F1 of open pollinated E.urophylla, height,DBH and volume showed depression to a certain degree,but not significant;Here again,water content of green wood,wood density and bark thickness showed no significant depression.④F1 of E.urophylla×grandis showed significant hybrid superiority in height,DBH and volume,but the hybrid superiority percentage of different cross pairs varied greatly;It showed no hybrid superiority in water content of green wood,wood density and fiber length;Its bark thickness and content of 1% NaOH extractives decreased evidently.展开更多
以籼粳杂交稻有代表性的品种甬优11、甬优12、甬优13、甬优15、甬优17为试材,通过栽培措施的调控,形成超高产(产量≥12.0 t hm–2)和高产(10.5 t hm–2≤产量<12.0 t hm–2)群体。比较研究其特征表明,与高产群体比,超高产群体的总颖...以籼粳杂交稻有代表性的品种甬优11、甬优12、甬优13、甬优15、甬优17为试材,通过栽培措施的调控,形成超高产(产量≥12.0 t hm–2)和高产(10.5 t hm–2≤产量<12.0 t hm–2)群体。比较研究其特征表明,与高产群体比,超高产群体的总颖花量极显著提高,而结实率和千粒重略降低;平均每穗粒数极显著提高,并且一、二次枝粳数以及粒数显著或极显著提高;拔节期的干物重略低,但抽穗期和成熟期的干物重均显著或极显著提高;其有效分蘖临界叶龄期至拔节期的生长平稳,无效分蘖发生少,高峰苗低,拔节期以后茎蘖数下降平缓,成穗率、叶面积指数、光合势、干物质积累量等均较高;基部第1、第2、第3节间的茎秆粗度和茎壁厚度及基部第1、第2、第3节间的弯曲力矩、抗折力均显著或极显著提高,且倒伏指数减小。展开更多
文摘With F1 of self pollinated Eucalyptus urophylla, F1 of inter tree pollinated E.urophylla, F1of open pollinated E.urophylla and F1 of E.urophylla×grandis as materials,inbreeding depression and hybrid superiority in growth and wood traits are analyzed and discussed.The results are as follows.①There was a regularity for E.urophylla that F1 of self pollinated was subjected to more intense depression than F1 of open pollinated,and growth traits showed more signifcant depression than wood traits.②As to F1 of self pollinated E.urophylla, height,DBH and volume showed significant or extremely significant depression,while water content of green wood,wood density and bark thickness showed no significant depression.③As to F1 of open pollinated E.urophylla, height,DBH and volume showed depression to a certain degree,but not significant;Here again,water content of green wood,wood density and bark thickness showed no significant depression.④F1 of E.urophylla×grandis showed significant hybrid superiority in height,DBH and volume,but the hybrid superiority percentage of different cross pairs varied greatly;It showed no hybrid superiority in water content of green wood,wood density and fiber length;Its bark thickness and content of 1% NaOH extractives decreased evidently.
文摘以籼粳杂交稻有代表性的品种甬优11、甬优12、甬优13、甬优15、甬优17为试材,通过栽培措施的调控,形成超高产(产量≥12.0 t hm–2)和高产(10.5 t hm–2≤产量<12.0 t hm–2)群体。比较研究其特征表明,与高产群体比,超高产群体的总颖花量极显著提高,而结实率和千粒重略降低;平均每穗粒数极显著提高,并且一、二次枝粳数以及粒数显著或极显著提高;拔节期的干物重略低,但抽穗期和成熟期的干物重均显著或极显著提高;其有效分蘖临界叶龄期至拔节期的生长平稳,无效分蘖发生少,高峰苗低,拔节期以后茎蘖数下降平缓,成穗率、叶面积指数、光合势、干物质积累量等均较高;基部第1、第2、第3节间的茎秆粗度和茎壁厚度及基部第1、第2、第3节间的弯曲力矩、抗折力均显著或极显著提高,且倒伏指数减小。
