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<p>Starch is a key storage carbohydrate in plants whose metabolism is regulated by various factors, including light. Transitory starch is synthesised during the day and metabolised at night to support plant growth. Previous studies have indicated that the red/far-red light photoreceptor phytochrome A (phyA) influences transitory starch metabolism in tomato. In this study, we examined starch levels in the <i>phyB1</i> mutant of tomato under light and dark conditions, along with the expression of genes involved in starch synthesis and degradation. Compared to its isogenic wild-type, the <i>phyB1</i> mutant accumulates significantly less transitory starch under both sunlight and monochromatic red-light. RT-qPCR analysis revealed reduced expression of key starch metabolism genes in the <i>phyB1</i> mutant. These findings suggest that loss of phyB1 activity reduces transitory starch abundance in tomato by modulating the expression of genes in the starch metabolic pathway.</p>

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PHYB1 Mutant of Tomato Shows Reduced Leaf Starch Accumulation Coupled with Altered Expression of Genes Participating in Starch Metabolism

  • 期刊论文

  • 发表日期：

    2026年5月5日

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  • Ophilia Ibapalei Lyngdoh Mawphlang,
  • Ramyani Bhattacharjee,
  • Highland Kayang,
  • Eros V. Kharshiing

摘要

Starch is a key storage carbohydrate in plants whose metabolism is regulated by various factors, including light. Transitory starch is synthesised during the day and metabolised at night to support plant growth. Previous studies have indicated that the red/far-red light photoreceptor phytochrome A (phyA) influences transitory starch metabolism in tomato. In this study, we examined starch levels in the phyB1 mutant of tomato under light and dark conditions, along with the expression of genes involved in starch synthesis and degradation. Compared to its isogenic wild-type, the phyB1 mutant accumulates significantly less transitory starch under both sunlight and monochromatic red-light. RT-qPCR analysis revealed reduced expression of key starch metabolism genes in the phyB1 mutant. These findings suggest that loss of phyB1 activity reduces transitory starch abundance in tomato by modulating the expression of genes in the starch metabolic pathway.