Estimating rice amylose content from <i>Wx</i> alleles and weather data and determining suitable cultivation areas for new high-yield, low-amylose lines in Tohoku region of Japan

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  • アミロース遺伝子型と登熟期の気象条件による白米アミロース含有率の推定手法の開発と東北地方における新規多収低アミロース米系統の栽培適地判定
  • アミロース イデンシガタ ト トウジュクキ ノ キショウ ジョウケン ニ ヨル ハクマイ アミロース ガンユウリツ ノ スイテイ シュホウ ノ カイハツ ト トウホク チホウ ニ オケル シンキ タシュウテイアミロース ベイ ケイトウ ノ サイバイ テキチ ハンテイ

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Abstract

<p>　The demand for ready-made meals is growing rapidly. Low-amylose rice is preferred for its stickiness and softness after cooking and cooling. In addition, processors demand a stable amylose content for reliable production. However, existing low-amylose cultivars have variable amylose contents and low yields. A Waxy allele, Wx-mq, which confers a stable low amylose content, has been used in low-amylose cultivars such as ‘Kiraho’, from which ‘Iwate 144’ and ‘Iwate 147’, with improved yield performance, have been developed. To identify suitable growing regions, we developed an equation using Ridge regression to predict amylose content from alleles at the Wx locus and weather conditions during the grain filling stage. The equation can predict amylose content with RMSE = 1.1 ％ and R2 = 0.992 of lines with both Wx-b (middle-amylose) and Wx-mq (low-amylose) alleles. The equation was combined with a rice development model and applied to the Tohoku region of northeastern Japan. Using 30-year-average amylose content and stability, the equation identified northern Iwate Prefecture and northeastern Aomori Prefecture as suitable for growing the variety. Simulations conducted for later-maturing low-amylose cultivars currently under development suggested that these cultivars would have a higher amylose content than ‘Iwate 144’ and ‘Iwate 147’. Thus, cultivars with a wide range of maturities will contribute to increased production through the expansion of suitable locations. We conclude that selecting the appropriate maturity group according to climate is important to meeting the requirements for stable amylose content and high yield of low-amylose cultivars, and will contribute to large-scale planting of new low-amylose cultivars with reliable amylose content.</p>

Journal

  • Climate in Biosphere

    Climate in Biosphere 23 (0), 51-60, 2023-07-10

    The Society of Agricultural Meteorology of Japan

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