Department of Soil Science and Plant Nutrition, Akdeniz University, Faculty of Agriculture, Antalya, Turkey.
PLoS One. 2021 Feb 2;16(2):e0246493. doi: 10.1371/journal.pone.0246493. eCollection 2021.
Salinity is among the most important abiotic stresses, which negatively affect growth, nutrient uptake and yield of crop plants. Application of different micronutrients, particularly zinc (Zn) have the potential to ameliorate the negative impacts of salinity stress. However, the role of Zn in improving salinity tolerance of basil (Ocimum basilicum L.) is poorly understood. This study evaluated the impact of different Zn levels (0, 5 and 10 mg kg-1) on growth and nutrient acquisition traits of basil under different salinity levels (0, 0.5, 1.0 and 1.5% NaCl). Data relating to biomass production, chlorophyll index, sodium (Na), potassium (K) uptake, K/Na ratio, Zn, copper (Cu), manganese (Mn) and iron (Fe) uptake were recorded. Increasing salinity level reduced biomass production, chlorophyll index and nutrient uptake traits (except for Na and Fe accumulation) of basil. Zinc application (10 mg kg-1) improved biomass production, chlorophyll index and nutrient acquisition traits under normal as well as saline conditions. The reduction in chlorophyll index and biomass production was higher under 0 and 5 mg kg-1 than 10 mg kg-1 Zn application. The K concentration decreased under increasing salinity; however, Zn application improved K uptake under normal as well as saline conditions. Different growth and nutrient acquisition traits had negative correlations with Na accumulation; however, no positive correlation was recorded among growth and nutrient uptake traits. The results revealed that Zn application could improve the salinity tolerance of basil. However, actual biochemical and genetic mechanisms involved in Zn-induced salinity tolerance warrant further investigation.
盐度是最重要的非生物胁迫因素之一，它会对作物的生长、养分吸收和产量产生负面影响。施用不同的微量元素，特别是锌（Zn），有可能减轻盐胁迫的负面影响。然而，Zn 提高罗勒（Ocimum basilicum L.）耐盐性的作用尚不清楚。本研究评估了不同 Zn 水平（0、5 和 10 mg kg-1）对不同盐度（0、0.5、1.0 和 1.5% NaCl）下罗勒生长和养分吸收特性的影响。记录了与生物量生产、叶绿素指数、钠（Na）、钾（K）吸收、K/Na 比、Zn、铜（Cu）、锰（Mn）和铁（Fe）吸收有关的数据。盐度升高降低了罗勒的生物量生产、叶绿素指数和养分吸收特性（除 Na 和 Fe 积累外）。Zn 施用（10 mg kg-1）在正常和盐胁迫条件下均提高了生物量生产、叶绿素指数和养分吸收特性。在 0 和 5 mg kg-1 Zn 处理下，叶绿素指数和生物量生产的降低高于 10 mg kg-1 Zn 处理。随着盐度的升高，K 浓度降低；然而，Zn 施用提高了正常和盐胁迫条件下的 K 吸收。不同的生长和养分吸收特性与 Na 积累呈负相关；然而，在生长和养分吸收特性之间没有记录到正相关。结果表明，Zn 施用可以提高罗勒的耐盐性。然而，Zn 诱导耐盐性所涉及的实际生化和遗传机制需要进一步研究。
