Screening and Identification of Saline-Tolerant Germplasm in Melon

Author:

Yang Wenli1,Ling Yueming1,Li Meihua1,Zhang Xuejun1,Liu Bin1ORCID

Affiliation:

1. Hami-Melon Research Center, Xinjiang Academy of Agricultural Sciences, Urumqi 830091, China

Abstract

Melon (Cucumis melo L.) holds significant importance as a horticultural crop, but it faces several yield-limiting factors, including salinity stress. While salinity traditionally hampers the vegetative growth of melon and detrimentally impacts fruit development and quality, certain melon cultivars exhibit the ability to flourish in conditions of relatively high soil salinity. However, truly salt-tolerant melon varieties are quite rare. In this article, we conducted seedling indoor tests, assessed morphological, physiological and biochemical indices, and explored different salt tolerance types among five melon varieties. As a result, we identified three salt-tolerant varieties, with ‘kuizilike’ (KLK) demonstrating the most impressive performance under salt stress. ‘KLK’ exhibited minimal growth and development constraints during salt stress, with the lowest Na+ content, the highest K+ content, and the highest K+/Na+ ratio. Moreover, it displayed the lowest content of malondialdehyde, the highest concentrations of osmoregulation substances, and the highest activity of antioxidant enzymes. Real-time fluorescence quantitation PCR results revealed significantly elevated gene expression levels of TPK, NHX2, LTP, POD, SuSy, HK, PRP and P5CR in ‘KLK’ compared to other varieties. These newly identified salt-tolerant melon germplasms will serve as valuable genetic resources for future studies on the mechanisms underlying melon salt tolerance, and provide insights into melon improvement and molecular breeding.

Funder

Xinjiang Academy of Agricultural Sciences Science and technology innovation key cultivation Special project

Project of Renovation Capacity Building for the Young Sci-Tech Talents Sponsored by Xinjiang Academy of Agricultural Sciences

China Agriculture Research System of MOF and MARA

Publisher

MDPI AG

Subject

Plant Science,Agronomy and Crop Science,Food Science

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