Evaluation of Storage Tolerance in Semi-Waxy Japonica Rice Varieties (Lines) with the Wxmp Genotype
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Institute of Food Crops, Jiangsu Academy of Agricultural Sciences/East China Branch of National Center of Technology Innovation for Saline-Alkali Tolerant Rice/Jiangsu High Quality Rice R&D Center, Nanjing 210014

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Jiangsu Agricultural Science and Technology Innovation Fund[CX(21)3108];National Key Research and Development Programs(2022YFE0117800);The Modern Agricultural Industry Technology System(CARS-01)

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    Abstract:

    Grain quality deterioration during rice aging storage has caused serious losses to rice production and management. It is of great significance to carry out research on storage tolerance and identify rice varieties with high storability. In this study, 197 semi-waxy japonica varieties, 117 common japonica varieties and 14 waxy japonica varieties were used. The storage tolerance characteristics was analyzed at the artificial high temperature and high humidity condition using the evaluation index of the storage tolerance index (SDI) that defines based reduction percentage of germination rate before and after aging. According to SDI, these genotypes were divided into four groups: group I was the high storability type, 75%≤SDI<100%, including 8 semi-waxy japonica rice and 15 common japonica rice; group II was the relative storability type, 50%≤SDI<75%, including 32 semi-waxy japonica rice, 44 common japonica rice and 1 waxy rice; group III was the less storability type, 25%≤SDI<50%, including 82 semi-waxy japonica rice, 32 common japonica rice and 4 waxy rice; group IV was non-storability type, 0≤SDI<25%, including 75 semi-waxy japonica rice, 26 common japonica rice and 9 waxy rice. The storage tolerance of semi-waxy japonica rice, which was higher than that of the waxy rice, was lower than that of common japonica rice. The analysis of storage tolerance among different growth-development types showed that only the early-maturing medium type in both of semi-waxy and common japonica rice had the lowest storability value. Using the reduction percentage of freshness value (RPFV), semi-waxy japonica rice showing lower storability than common japonica rice and higher storability than waxy japonica rice was observed. Through the comprehensive evaluation of SDI and RPFV, four semi-waxy japonica rice (BG26, BG69, BG81 and BG164) and nine common japonica rice (Nanjing-qinggu, CG10, CG23, CG25, CG28, CG32, CG38, CG49 and CG71) were obtained with high storability. Collectively, the research provided germplasm materials applicable for the storability improving of rice varieties and exploring the storage tolerance gene resources.

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History
  • Received:February 10,2023
  • Revised:March 20,2023
  • Adopted:
  • Online: August 30,2023
  • Published: August 30,2023
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