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Growth and ion uptake of four Brassica species as affected by Na/Ca ratio in saline sand culture
Author(s) -
Ashraf M.,
Naqvi M. I.
Publication year - 1992
Publication title -
zeitschrift für pflanzenernährung und bodenkunde
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 0044-3263
DOI - 10.1002/jpln.19921550206
Subject(s) - shoot , brassica , brassica carinata , germination , saline , horticulture , salinity , dry matter , botany , chemistry , biology , zoology , ecology , endocrinology
The influence of supplemental Ca 2 in saline nutrient solutions on germination, growth, and ion uptake of four Brassica species, B. campestris L., B. carinata, A.Br., B. juncea (L.) Czern. and Coss., and B. napus L. was studied in sand culture. The addition of 11.25 mM CaC1 2 to nutrient solution containing 225 mM NaC1 improved percentage of germination of B. napus and B. juncea, but had no significant effect on the germination speed of the four species. There was no significant effect of additional amount of Ca 2 in the saline medium (150 mM NaC1) on the shoot biomass and seed yield of B. carinata and B. campestris. By contrast, shoot dry matter of B. napus and B. juncea increased significantly with the increased in Ca 2 concentration of the growth medium, but their seed yield remained unaffected. Decreased Ca 2 concentrations of the saline growth medium reduced percent oil content in B. carinata, B. juncea, and B. campestris. Increasing Na/Ca ratio of the external medium affected ion uptake differently in different species. In B. carinata, a relatively salt‐tolerant species, the concentrations of Na + and K + in the shoots remained unaffected, but the C1 concentration was reduced linearly with the increase in external Na/Ca ratios. Root K + and Ca 2+ of the species decreased with the decrease in Ca 2+ supply. In B. campestris increasing Na/Ca ratios of the saline medium had no effect on the concentrations of Na + , C1, and Ca 2+ in the shoots and Na + , C1, and K + in the roots. Only shoot K + and root Ca 2+ decreased consistently. In the highly salt‐sensitive species, B. napus, the shoot Na + was reduced by the addition of Ca 2+ in the salt treatment, whereas the C1 and Ca 2+ uptake was promoted by supplemental Ca 2+ . The root K + concentrations decreased with the increase in Na/Ca. In B. juncea, which was similar to B. napus in biomass production, high Ca 2+ concentration in the salt treatment reduced the shoot Na + and root C1 concentrations and promoted the K + uptake. Shoot Na/Ca and Na/K ratios were increased in B. napus and B. juncea at the highest Na/Ca ratio of the growth medium. Shoot K + selectivity, S K,Na (determined as molar ratio of K: Na in tissue to molar ratio of K:Na in external medium) of all species remained unaffected except for B. juncea in which it decreased significantly at the highest Na/Ca ratio. The root K + selectivity increased in B. carinata.