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Auxin Application at the Flowering Stage of Rice Alleviates the Negative Impact of Heat Stress on Spikelet Fertility and Yield Attributes

Author

Listed:
  • Shafiqullah Aryan

    (Department of International Agricultural Development, Graduate School of Agriculture, Tokyo University of Agriculture, Tokyo 156-8502, Japan
    Faculty of Agriculture, Nangarhar University, Daronta 2601, Afghanistan)

  • Gulbuddin Gulab

    (Department of International Agricultural Development, Graduate School of Agriculture, Tokyo University of Agriculture, Tokyo 156-8502, Japan
    Faculty of Agriculture, Nangarhar University, Daronta 2601, Afghanistan)

  • Kifayatullah Kakar

    (Faculty of Agriculture, Nangarhar University, Daronta 2601, Afghanistan)

  • Nasratullah Habibi

    (Department of International Agricultural Development, Graduate School of Agriculture, Tokyo University of Agriculture, Tokyo 156-8502, Japan
    Faculty of Agriculture, Balkh University, Balkh 1702, Afghanistan)

  • Mohammad Wasif Amin

    (Department of International Agricultural Development, Graduate School of Agriculture, Tokyo University of Agriculture, Tokyo 156-8502, Japan
    Faculty of Agriculture, Parwan University, Charikar 1102, Afghanistan)

  • Mohammad Ismail Sadat

    (Faculty of Agriculture, Nangarhar University, Daronta 2601, Afghanistan)

  • Tayebullah Zahid

    (Faculty of Agriculture, Nangarhar University, Daronta 2601, Afghanistan)

  • Asmatullah Durani

    (Faculty of Agriculture, Nangarhar University, Daronta 2601, Afghanistan)

  • Bakht Munir Baber

    (Faculty of Agriculture, Nangarhar University, Daronta 2601, Afghanistan)

  • Zabihullah Safi

    (Faculty of Agriculture, Nangarhar University, Daronta 2601, Afghanistan)

  • Anwarulhaq Zerak

    (Faculty of Agriculture, Nangarhar University, Daronta 2601, Afghanistan)

Abstract

The reproductive stage of rice is vulnerable to heat stress, which reduces spikelet fertility and yield. Auxin significantly influences reproductive development, hence the research aimed to enhance spikelet fertility and grain attributes in rice plants by exploring the application efficiency of Indole-3-acetic acid (IAA) and 1-naphthaleneacetic acid (NAA) under heat stress. This study investigated the effects of IAA (10 μmol L −1 ) and NAA (100 μmol L −1 ) on spikelet fertility rate in six rice genotypes during the flowering stage. Compared to the heat stress (HS) treatment, the spikelet production rate and grain yield per plant were higher by 61.16%, 37.25%, and 33.07%, and 72.84%, 44.48%, and 32.71% in control, HS + NAA, and HS + IAA treatments, respectively. In addition, panicle weight, primary branches number panicle −1 , and 1000-grains weight were significantly ( p < 0.05) improved with HS + IAA and HS + NAA application under heat stress conditions. Auxin application enhanced photosynthetic and transpiration rate, while contrarily, leaf temperature diminished. The higher photosynthetic rate showed positive relationships with spikelet fertility (r = 0.64) and yield plant −1 (r = 0.63). Additionally, leaf temperature had a strongly negative correlation (r = −0.81) with the spikelet fertility rate. The application of auxin increased the number of filled grains panicle −1 , which showed a positive relationship (r = 0.75) with grain yield plant −1 . The variation of spikelet fertility rate among genotypes was dependent on the variety tolerance rate. Overall, these findings indicate that exogenous auxin application can mitigate the negative impact of heat stress on rice and improve spikelet fertility and grain yield.

Suggested Citation

  • Shafiqullah Aryan & Gulbuddin Gulab & Kifayatullah Kakar & Nasratullah Habibi & Mohammad Wasif Amin & Mohammad Ismail Sadat & Tayebullah Zahid & Asmatullah Durani & Bakht Munir Baber & Zabihullah Safi, 2023. "Auxin Application at the Flowering Stage of Rice Alleviates the Negative Impact of Heat Stress on Spikelet Fertility and Yield Attributes," Agriculture, MDPI, vol. 13(4), pages 1-14, April.
    • Handle: RePEc:gam:jagris:v:13:y:2023:i:4:p:866-:d:1123320
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    References listed on IDEAS

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    1. Kifayatullah Kakar & Tran Dang Xuan & Saidajan Abdiani & Imran Khan Wafa & Zubair Noori & Shakeib Attai & Tran Dang Khanh & Hoang-Dung Tran, 2019. "Morphological Observation and Correlation of Growth and Yield Characteristics with Grain Quality and Antioxidant Activities in Exotic Rice Varieties of Afghanistan," Agriculture, MDPI, vol. 9(8), pages 1-13, August.
    2. Jeff Tollefson, 2020. "How hot will Earth get by 2100?," Nature, Nature, vol. 580(7804), pages 443-445, April.
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