Journal of Food, Agriculture and Environment

Growth performance and ionic composition of Chinese kale (Brassica oleracea var. alboglabra L.) plants grown under saline conditions

Author(s):

Amin Tayebi-Meigooni, Yahya Awang *, Adam Puteh, Babak Madani, Amirmahdi Khalatbari

Recieved Date: 2014-01-05, Accepted Date: 2014-03-18

Abstract:

In order to assess the changes in growth and ionic composition of the Chinese kale (Brassica oleracea var. alboglabra) plants under salinity, a greenhouse experiment was conducted. Three-week-old plants were installed in hydroponic with varying concentrations of NaCl (0, 25, 50, 75 and 100 mM) for two weeks. The growth indices including leaf area index (LAI), crop growth rate (CGR), relative growth rate (RGR), net assimilation rate (NAR) and leaf area ratio (LAR) besides nutrient composition in both leaf and root tissues were estimated. Increasing salinity level (>25 mM) in root zone negatively affected plant growth. The effects were identified using variation in growth indices through hyperosmotic pressure and ion toxicity at early and mid/final stages of salinity, respectively. The preliminary changes depicted over correspondingly reduced LAR and NAR, which diminished RGR at beginning of imposing salinity. The secondary RGR reduction mainly attributed with suppression of NAR at moderate salinity level (50 mM), and concomitance of both NAR and LAR inhibition for higher salinity (75 and 100 mM) at the end of experiment. Increasing the level of Na and Cl adversely affected plant K, Ca, Mg and N content in both leaf and root tissues. Despite leaf P content, salinity induced root P to the point, which may be hazardous to root cells. Reduction of N and Mg availability for various processes such as chlorophyll biosynthesis, phosphorus shortage in bioenergetic pathway, besides imbalance of K and Ca and negative effects of Na and Cl to different bioactive processes were also considered to be responsible for growth reduction in this plant.

Keywords:

Growth analysis, leaf area ratio, relative growth rate, net assimilation rate, crop growth rate, sodium, potassium, calcium, magnesium, chloride, phosphorus, nitrogen

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Journal: Journal of Food, Agriculture and Environment
Year: 2014
Volume: 12
Issue: 2
Category: Agriculture
Pages: 307-313

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