Salinity level influenced morpho-physiology and nutrient uptake of young citrus rootstocks

Sour orange (Citrus aurantium L.) and Volkamer Lemon (Citrus volkameriana) are two multiple use species that are generally grown as rootstock for sweet oranges. They comprise over 70% of the rootstocks used in Jordan for various citrus scions. Although citrus is highly sensitive to salinity, we hypothesize that rootstocks response to salt stress is different. This study was undertaken to evaluate salt tolerance level of two important rootstock and to identify their potential use in improving salinity tolerance in citrus. Seedling growth and ion and nutrients uptake and partitioning as well as physiological responses such as chlorophyll content and stomatal resistance and their impact on growth and development were also evaluated under greenhouse conditions.

酸橙（Citrus aurantium L.）与沃勒默柠檬（Citrus volkameriana）为两种多用途物种，通常被用作甜橙的砧木（rootstock）。二者占约旦用于各类柑橘接穗（scion）的砧木总量的70%以上。尽管柑橘对盐分胁迫高度敏感，但本研究假设不同砧木对盐胁迫的响应存在显著差异。本研究旨在评估这两种重要砧木的耐盐水平，并明确其在提升柑橘耐盐性方面的潜在应用价值。在温室条件下，本研究还对幼苗生长、离子与养分的吸收及分配情况，以及叶绿素含量、气孔阻力（stomatal resistance）等生理响应指标及其对植株生长发育的影响进行了系统评估。