Seedling Stage Determination and Selection of Leuce Hybrid Progeny

SUN Chao; CAO Banghua

doi:10.11923/j.issn.2095-4050.cjas2024-0013

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Journal of Agriculture ›› 2025, Vol. 15 ›› Issue (4) : 35-41. DOI: 10.11923/j.issn.2095-4050.cjas2024-0013

Seedling Stage Determination and Selection of Leuce Hybrid Progeny

SUN Chao ¹ ,
CAO Banghua ²

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Abstract

In order to screen out the superior individual in the hybrid seedlings of poplars, and then select the excellent clones, we analyzed the genetic variation of the two-year-old seedlings of poplars using the cutting cross technology. The results showed that the growth, branch and leaf traits of different crossing combinations and different individuals of the same crossing combination had considerable genetic variation. Their family heritabilities were all above 0.81, which belonged to high heritability, indicating that the variation among cross-combinations was controlled by genetic factor. The results of multiple comparison showed that (P. alba× P. glandulosa) × P. bolleana × (P. tomentosa × P. bolleana) × P. canescens, (P. alba× P. gnaludotas ‘1’) × (P. tomentosa× P. bolleana) × P. canescens, (P. alba× P. glandulosa) × P. bolleana × (P. tomentosa× P. bolleana) × P. canescens had fast growth. Among the three cross combinations, (P. alba× P. glandulosa)× P. bolleana, P. alba× P. gnaludotas ‘1’, (P. alba× P. glandulosa)× P. bolleana were used as female parents and (P. tomentosa× P. bolleana)× P. canescens was used as male parent, the four parents were regarded as excellent germplasm resources. 20 seedlings were selected as superior individual plants, the average enrolment rate was 4.22%. 3-104×MY and YX1×MY were selected as superior cross combinations, which laid a foundation for the selection of excellent clones.

Key words

Leuce / hybridization / hybrid offspring / genetic variation / selection / asexuline selection / superior individua

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SUN Chao , CAO Banghua. Seedling Stage Determination and Selection of Leuce Hybrid Progeny[J]. Journal of Agriculture. 2025, 15(4): 35-41 https://doi.org/10.11923/j.issn.2095-4050.cjas2024-0013

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Cited in this article [1] Abstract

为鉴定杨树杂交子代真实性及阐明子代群体的遗传关系,本研究以窄冠型杨树的7个杂交子代群体和亲本为试验材料,并采用SRAP分子标记技术对其进行子代真实性鉴定及遗传变异研究。从110对引物中筛选出了8对多态性高,主条带清晰且稳定的引物,对7个杂交子代群体扩增,共产生126条谱带,其中多态性带为118条,多态带比例(PPB)达93.65%;基于PopGen 32软件对7个杂交组合的遗传多样性分析表明,派内杂交时,黑杨派内杂交子代的遗传多样性水平低于白杨派内的遗传多样性水平;派间杂交时,白杨做母本的子代遗传多样性比黑杨做母本的遗传多样性丰富。对其中4个杂交组合的当年杂种苗的生长量、形质指标与其亲本间遗传距离进行相关性分析,结果表明,亲本间遗传距离与苗木的地径、苗高成正相关,与其分枝角度成负相关。70个杂交子代均具有父本特征带,且经鉴定全部为真杂种,本试验结果为杨树杂交亲本的筛选及杂交子代早期鉴定提供了一定的理论依据和技术参考。

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