Variability of seedling vigour in Persian walnut as influenced by the vigour and bearing habit of the mother tree
Variability of seedling vigour in Persian walnut as influenced by the vigour and bearing habit of the mother tree
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DOI：
10.1080/14620316.2009.11512509
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发表时间：
2009-03-01
影响因子：
1.9
通讯作者：
Valizadeh, M.
中科院分区：
文献类型：
--
作者：
Rezaee, R.;Vahdati, K.;Valizadeh, M.
通过在苗圃中对波斯核桃矮苗和早熟苗的观察，以及在果园条件下对其生长一致性的观察，我们进一步研究了与幼苗活力相关的形态性状的遗传性质和变异。在本研究中，分别于2006年和2007年对6个和18个半同胞家庭的开放授粉后代进行了两项试验。45龄和1龄幼苗的苗高、茎粗、节数和节间长在科内和科间均存在显著差异。家族间方差估计为中高遗传力（0.39 ~ 0.88），表明大多数表型变异受加性遗传控制。苗高与苗径（r = 0.87）、节数（r = 0.86）和节间长（r = 0.89）呈正相关，表明仅测定苗高就足以鉴定矮苗科。矮苗一般出现在低活力和群生家族的后代中。讨论了早熟苗在矮化核桃砧木和/或品种遗传发育中的相关性。综上所述，我们建议对矮秆和易根基因型进行循环选择，以充分利用其在高密度果园体系中的优势。
Observations on dwarf and precocious (early maturing) seedlings of Persian walnut (Juglans regia L.) in nurseries, and the consistency of their growth under orchard conditions, encouraged us to study the genetic nature and variability of morphological traits related to seedling vigour. In the present study, two trials were conducted using open-pollinated offspring of six and 18 half-sib families in 2006 and in 2007, respectively. Significant variation was found both within and between families in terms of seedling height, stem diameter, the number of nodes, and internode length in both 45-d-old and 1-year-old seedlings. Moderate to high heritability (0.39 - 0.88) was estimated by between-family variance, implying that the majority of phenotypic variations were under additive genetic control. Seedling height was positively correlated with seedling diameter (r = 0.87), the number of nodes (r = 0.86), and the length of the internodes (r = 0.89), indicating that measuring only seedling height was adequate to identify families that produce dwarf seedlings. The shortest seedlings were generally observed in the offspring of low-vigour and cluster-bearing families. The relevance of early maturing seedlings in developing genetically dwarf walnut rootstocks and/or cultivars is discussed. In conclusion, we suggest a recurrent selection programme for the selection of dwarf and easy-to-root genotypes, in order to exploit their advantages in a high-density orchard system.