Aerobic adaptability identification and comprehensive evaluation of upland rice at early seedling stage

ZHANG Deyu; CHALI Biru Alemu; PHYU Phyu Thin; LU Chengkai; LU Bingyue; LU Dingke; WANG Xiaoning; WAN Jinpeng; XU Peng

doi:10.7671/j.issn.1001-411X.202308020

Journal of South China Agricultural University > 2023 > 44(6): 915-924. > DOI: 10.7671/j.issn.1001-411X.202308020

ZHANG Deyu, CHALI Biru Alemu, PHYU Phyu Thin, et al. Aerobic adaptability identification and comprehensive evaluation of upland rice at early seedling stage[J]. Journal of South China Agricultural University, 2023, 44(6): 915-924. DOI: 10.7671/j.issn.1001-411X.202308020

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Aerobic adaptability identification and comprehensive evaluation of upland rice at early seedling stage

1.
Key Laboratory of Sustainable Utilization of Tropical Plant Resources, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming 650223, China
2.
University of the Chinese Academy of Sciences, Beijing 101408, China
3.
Agricultural Technology Extension Service Center of Guangnan County, Guangnan 663300, China
4.
Institute of Cereal Crops, Hainan Academy of Agricultural Sciences/Key Laboratory of Crop Genetics and Breeding of Hainan Province, Haikou 570216, China

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Received Date: August 27, 2023
Available Online: November 12, 2023
Published Date: October 15, 2023

Graphical Abstract

Abstract

Abstract

Objective
The goal was to identify the aerobic adaptation of early seedlings of upland rice germplasm resources, screen out the superior germplasm resources with the abilities of seed germination under low water stress and seedling emergence from deep soil, and provide genetic materials and valuable guidance for breeding new viarieties with excellent aerobic adaptation.
Method
Under the conditions of 150 g/L polyethylene glycol (PEG6000) mimicking low water stress and 8 cm soil deep-seeding, 24 lowland rice (including ‘Huanghuazhan’, ‘longjing39’ and ‘jingyue1’) and 24 improved upland rice (including ‘Luying46’,‘IRAT318’ and ‘IRAT11’) varieties were used to evaluate the aerobic adaptability indicators. In addition, these indicators were assessed for 246 upland rice landraces. The principal component analysis, membership function and comprehensive evaluation value of aerobic adaptation were used to evaluate these germplasms, and they were classified by cluster analysis.
Result
The relative germination potential, germination rate, root length, bud length and root number between lowland and upland rice varieties under low water stress were significantly different, and could be used as indicators for identifying aerobic adaptation at the early seedling stage. Under deep-seeding condition, root length, shoot length, mesocotyl length and coleoptile length were mainly responsible for seedling emergence. According to their differences in aerobic adaptability, the germplasms could be divided into five types, including highly strong type (type Ⅰ), strong type (type Ⅱ), intermediate type (type Ⅲ), weak type (type Ⅳ) and extremely weak type (type Ⅴ). Finally, seven varieties with elite aerobic adaptability were obtained.
Conclusion
This study identified the indicators of aerobic adaptation and comprehensively assessed the upland rice landraces in Yunan, which could provide a basis for fostering dry direct-seeding rice varieties.
- Upland rice,
- Aerobic adaptation,
- Low water stress,
- Seed germination,
- Seedling emergence

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References (50)

References

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