Salinity reduces water use and nitrate-N-use efficiency of citrus
Salinity reduces water use and nitrate-N-use efficiency of citrus
复制标题
盐度降低了柑橘的用水量和硝态氮利用效率
DOI：
10.1006/anbo.1993.1079
复制
发表时间：
1993
期刊：
影响因子：
4.2
通讯作者：
J. Syvertsen
中科院分区：
文献类型：
--
作者：
J. Lea‐Cox;J. Syvertsen
摘要 将 5 个月大的 Cleopatra 柑橘 (Citrus reticulata Blanco) (CM) 和 Volkamer 柠檬 (Citrus volkameriana Ten. and Pasq.) (VL) 幼苗在温室中 2·3-1 盆 Candler 细沙中培育。用非盐水（ECe = 0·23 dS m-1）或盐水（6·13 dS m-1）水和 3:1 NaCl:CaCl2 溶液对植物进行为期 4 周的灌溉。 3周后以212 mg N1-1单次施用K15NO3（19·64原子％过量15N）代替正常的每周施肥，并在7天后收获植物。两种物种的蒸腾速率、氮吸收、生长和基于干重（mg d. wt mg-1 N）的氮利用效率（NUE）均因盐度而降低。根据叶子中的生长、用水和氯 (Cl) 积累，VL 比 CM 对盐更敏感，但两个物种的 15N 吸收均因盐度而减少。在 7 天的时间里，盐度对 15N 吸收的减少相对大于芽生长的影响，因此两个物种新芽生长的 15NUE (mg d. wt μg-115N) 均有所增加。没有证据表明 Cl 对硝酸盐 (NO3) 吸收有拮抗作用，但两个物种的植物总 15NO3 吸收与整个植物蒸腾量呈正相关。因此，NO3 吸收的减少似乎与用水量减少的关系比盐胁迫引起的 Cl 拮抗作用更密切。
Abstract Five-month-old Cleopatra mandarin (Citrus reticulata Blanco) (CM) and Volkamer lemon (Citrus volkameriana Ten. and Pasq.) (VL) seedlings were grown in a glasshouse in 2·3-1 pots of Candler fine sand. Plants were irrigated with either non-saline (ECe = 0·23 dS m-1) or saline (6·13 dS m-1) water using 3:1 NaCl:CaCl2 solution over a 4-week period. A single application of K15NO3 (19·64 atom % excess 15N) at 212 mg N1-1, was substituted for a normal weekly fertilization after 3 weeks and plants were harvested 7 d later. The transpiration rate, uptake of nitrogen, growth and nitrogen-use efficiency (NUE) on a dry weight basis (mg d. wt mg-1 N) of both species was reduced by salinity. Based on growth, water-use and chloride (Cl) accumulation in leaves, VL was more salt-sensitive than CM, but 15N uptake was equally reduced by salinity in both species. Salinity reduced 15N uptake relatively more than shoot growth over the 7-d period, such that the 15NUE (mg d. wt μg-115N) of new shoot growth of both species increased. There was no evidence of Cl antagonism of nitrate (NO3) uptake but total plant 15NO3 uptake was positively correlated with whole plant transpiration in both species. Thus, it appears that reductions in NO3 uptake are more strongly related to reduced water use than to Cl antagonism from salt stress.