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在广泛收集优良杨树基因资源的基础上,从中选择单项或多项遗传品质好的杨树品系进行杂交育种,通过选择优良杂交组合,利用水培、喷洒营养液、塑料薄膜覆盖等技术,使一些较难杂交成功的组合获得了种子或苗木。 相似文献
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杨树人工丰产林生产力的提高,不仅取决于栽培条件,尤为重要的是取决于它的遗传成分的改良,而进行杨树有性控制杂交又是杨树遗传改良的有效途径之一,本文根据几年来的杂交育种经验,对杨树水培杂交育种技术做一探讨。 1杂交组合的选配 根据速生、优质和抗寒育种改良目标,我们选择速生的南方型美洲黑杨和抗逆性强的北方型杨树品种做亲本进行杂交,选择亲本 26个、设计杂交组合 69个,其中 47个杂交组合获得成功,杂交成功率 68 1%,各品种间可配性高,成功率达 87%,白杨种与其它种之间可配性低,成功率仅达 12%,另外还做了多… 相似文献
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从世界杨树杂交育种的发展和成就看我国杨树育种研究 总被引:23,自引:0,他引:23
本文综述了世界范围杨树杂交育种研究的成就,把杨树育种策略的发展划分为CS(杂交和选择,SCS(选择,杂交和选择),BSCS(育种,选择,杂交和选择)3个时期,这3个时期标志着育种程序和方法由低级到高级的发展过程,同时概述了国际上杨树性状多层次贵传变异研究,重要育种目标性状遗传控制,育种目标和服务地区的多向性趋势,在把我国杨树育种40年的成就和研究水平与世界现有水平比较后,指出了今后应加强的研究领域 相似文献
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中国杨树杂交育种研究进展* 总被引:40,自引:0,他引:40
对我国 5 0余年杨属派内和派间杂交育种研究进行了综述。在众多的杨树杂交组合中 ,派内种间杂交以白杨派、黑杨派成就显著 ,派间杂交以青杨派与黑杨派杂交成果最为突出。从杂交方式看 ,有单交、双交、三交、回交等 ,以杂种作亲本进行再杂交能够获得显著杂种优势 ;从育种目标看 ,有速生、抗寒、抗旱、抗病虫、窄冠、生根等 ;从育种方法看 ,以常规人工杂交为主 ,将常规人工杂交与物理辐射、化学诱导等技术有机结合 ,能够创造出生产潜力较大的三倍体新品种。选育的杨树良种已在生产中产生了巨大的经济效益、生态效益和社会效益。最后 ,对目前我国杨树杂交育种中存在的主要问题以及应对策略进行了讨论。 相似文献
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在吉林省通榆县的风沙土上进行不同杨树品种的造林试验,结果表明:9 a生白林2号杨和白城5号杨平均胸径分别为14.8 cm和14.2 cm,为对照品种白城小黑杨的151%和145%;树高分别为13.4 m和13.7 cm,为对照的147%和150%,而且抗逆性强。白林2号杨和白城5号杨是风沙土造林的优良品种。 相似文献
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Variation Analysis of Seed and Seedling Traits of Cross Combination Progenies in Populus 总被引:2,自引:0,他引:2
Li Shan-wen Zhang Zhiyi He Cheng-zhong An Xin-min Yu Zhi-shui Li Bai-lian 《中国林学(英文版)》2005,7(3):61-69
Twenty-five species and hybrids in Populus were used as parents, and 26 cross combinations, including more than 5 000 seedlings, were obtained by artificial cross breeding. The length of infructescence, number of seeds per infructescence, thou-sand-seed weight, germination rate of seeds among these cross combinations were tested. The results indicated that the cross combi-national effects were significant for these traits, and demonstrated that the length of infructescence, thousand-seed weight were posi-tively affected by female parent. In addition, seedling height, diameter above ground, diameter at breast height (DBH) of 17 cross combination progenies were investigated. The analysis of mean and standard deviation of these three traits showed that seedling height, diameter above ground, DBH had extensive variation among combinations and individuals within combination. Variance analysis and estimate of heritability indicated that the three traits had wide variation and were controlled by heredity. It was feasible to select superior cross combinations and seedlings. Further more, the result of multiple comparison showed that P. deltoides ‘Lux’ × P. deltoides ‘D324’, P ussuriensis cl. ‘U4’ × P. deltoides ‘T66’, P. ussuriensis cl. ‘U4’ × P deltoides ‘T26’, P. deltoides ‘Lux’ × P.. . ussuriensis cl. ‘U3’, (P. m tos × P. bolleana) × (P alba × P. glandulosa), (P. alba × P. tomentosa) × (P. al × P. glandulosa ), and to en a . ba (P. alba × P. glandulosa ‘No. 2’) × P. tomentosa ‘Lumao 50’ were superior cross combinations with higher growth rate. Finally, 123 elite seedlings were selected for further test. 相似文献
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Cross breeding strategies are very efficient for gaining new and superior genotypes. Ninety-eight new white poplar hybrid clones produced from 12 cross combinations within the Section Leuce Duby were studied using genetic analysis and seedling tests. We exploited the wide variation that exists in this population and found that the differences among diameter at breast height (DBH), root collar diameter (RCD) and height (H) were statistically extremely significant. The repeatability of clones of these measured traits ranged from 0.947-0.967, which indicated that these traits were strongly controlled by genetic factors. Based on multiple compari- sons, a total of 25 clones showed better performance in growth than the control cultivar. These 25 clones were from six different cross combinations, which can guarantee a larger genetic background for future new clone promotion projects. This study provides a simple overview on these clones and can guide us to carry out subsequent selection plans. 相似文献