Interspecific cross breeding method for cucurbit (melon rootstock)

Abstract

The invention belongs to the technical field of breeding of cucurbitaceae vegetable. An interspecific hybrid F1 (Yong rootstock No. 6) of cucurbit (a melon rootstock) is obtained by hybridizing a female parent of a stable inbred line J03-2-3-2-1-5-7-4 by multi-generation of directed autocopuation screening of cucurbit materials originated from Japan and a male parent of a stable inbred line YH2-3-3-2-1-4-2-6 by multi-generation of directed autocopuation screening of local Lagenaria species produced in Ningbo. The melon rootstock selectively bred with the method provided in the invention meets objectives of breeding and has moderate growth potential, high resistance to die-back and root rot, well-developed roots, strong stalks, strong ability in absorbing nutrient, low degree of vain growth and robust hypocotyls which are not easy to become hollow, and therefore the melon rootstock is favorable for grafting. The melon rootstock has good grafting affinity and strong symbiosis affinity, and a survival rate over 95% is obtained for the grafting of the rootstock onto the watermelon specie ''Zaojia'' (8424). The engrafted melon rootstock is low temperature-resistant, moisture-resistant and barren-resistant; after field planting, the root and overground part of a grafted seedling grows fast and has sound growth potential, and the period of first harvest of the grafted seedling is 5 days earlier than that of a self-rooted seedling, the fruition rate is high and stable, weight of single fruit and fruit shape can substantially maintain the same, melon skin is not thickened, sugar degree of the grafted seedling is higher than that of the self-rooted seedling, sugar degree gradient is small, quality of the watermelon is not affected, and good adaptability is obtained.

Description

technical field [0001] The invention belongs to the technical field of Cucurbitaceae vegetable breeding, and relates to a method for breeding sexual hybrids of gourds (cucurbit rootstocks), in particular to the breeding of a new sexual hybrid combination 'Yongzhen No. 6' of gourds (cucurbits rootstocks) . Background technique [0002] Watermelon has a long history of cultivation in my country, with wide distribution and long supply time. It is the main fruit in spring, summer and autumn, and is deeply loved by consumers. Among them, the cultivated area in Zhejiang Province in 2008 was 1.43 million mu, which is the largest in Zhejiang Province. One of the economic crops. Therefore, the healthy development of the watermelon industry is directly related to the increase of farmers' income and agricultural efficiency. In recent years, due to the rapid expansion of the protected cultivation area of ​​melon crops and the continuous improvement of the multiple cropping index, the c...

AI Technical Summary

Problems solved by technology

[0004] The present invention solves the problems of poor adaptability, poor moisture resistance, serious root rot occurrence of domestic melon rootstock varieties in Zhejiang, high seed prices of foreign excellent rootstock varieties, etc., and provides a sexual hybrid breeding of melon rootstocks. The method is to select and breed new melon rootstock varieties that are resistant to fusarium wilt, root rot, have strong grafting affinity and symbiosis affinity with main watermelon varieties, and do not affect the quality and high yield of watermelons, and are suitable for the cultivation conditions in Zhejiang, so as to solve the lack of quality in watermelon production. The problem of high-quality and low-cost grafting rootstock varieties