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<p>The growth of <i>Larix</i> species has been improved by hybridization, while the hybrid with salt-intolerant species may not be useful for afforestation in saline soil. This study evaluated the relationship between growth responses to salt stress and root functional traits in seedlings of <i>L. gmelinii</i> var. <i>japonica</i>, <i>L. kaempferi</i>, and their hybrid (<i>L. gmelinii var. japonica</i> × <i>L. kaempferi</i>). In a greenhouse, two-year-old seedlings were cultivated with 70&#xa0;mM of NaCl loading. Roots were divided into tap roots, lignified woody lateral roots, and nonlignified feeder lateral roots. The dry mass, total length and total area and Na concentration of each root were evaluated. The total dry mass of hybrid larch was higher than <i>L. gmelinii</i> regardless of salt stress. The total dry mass and total length of a tap root was suppressed in <i>L. kaempferi</i> by NaCl loading, but not in the other two species. These results demonstrated that the variation in salt tolerance was associated with the vertical distribution of root growth. While Na concentration in primary roots was increased in <i>L. kaempferi</i> and hybrid larch under NaCl loading, the dry mass of primary roots was reduced only in <i>L. kaempferi</i>. In <i>L. gmelinii</i>, dry mass in a tap root and secondary roots were not decreased with the highest Na concentration, indicating the tolerance to Na toxicity accumulated in these roots. Hybrid larch showed no growth suppression with increasing Na concentration in primary roots, suggesting that its superior salt tolerance would be inherited from the mother parent.</p>

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Interspecific variation in root morphological traits under salt stress among Larix gmelinii, L. kaempferi, and their hybrid

  • 期刊论文

  • 发表日期：

    2025年12月31日

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  • Tetsuto Sugai,
  • Naoki Makita,
  • Hikari Yahara,
  • Toshihiro Watanabe

摘要

The growth of Larix species has been improved by hybridization, while the hybrid with salt-intolerant species may not be useful for afforestation in saline soil. This study evaluated the relationship between growth responses to salt stress and root functional traits in seedlings of L. gmelinii var. japonica, L. kaempferi, and their hybrid (L. gmelinii var. japonica × L. kaempferi). In a greenhouse, two-year-old seedlings were cultivated with 70 mM of NaCl loading. Roots were divided into tap roots, lignified woody lateral roots, and nonlignified feeder lateral roots. The dry mass, total length and total area and Na concentration of each root were evaluated. The total dry mass of hybrid larch was higher than L. gmelinii regardless of salt stress. The total dry mass and total length of a tap root was suppressed in L. kaempferi by NaCl loading, but not in the other two species. These results demonstrated that the variation in salt tolerance was associated with the vertical distribution of root growth. While Na concentration in primary roots was increased in L. kaempferi and hybrid larch under NaCl loading, the dry mass of primary roots was reduced only in L. kaempferi. In L. gmelinii, dry mass in a tap root and secondary roots were not decreased with the highest Na concentration, indicating the tolerance to Na toxicity accumulated in these roots. Hybrid larch showed no growth suppression with increasing Na concentration in primary roots, suggesting that its superior salt tolerance would be inherited from the mother parent.