Differences of Potassium Efficiency and Root Responses to Potassium Deficiency Between Short- and Long-season Cotton Genotypes

doi:10.7668/hbnxb.2014.05.037

Abstract

Abstract: To verify the differences between short- and long-season cotton genotypes in K efficiency and root responses to K deficiency,two early-maturity/short-season cotton genotypes(CCRI50,BAIMIAN2)and two mid-maturity/long-season cotton ones(BAIMIAN1,CCRC28)were used to carry out the seedling hydroponic experiment,in which the seedlings of cotton were transferred to the solutions containing two different K concentrations,i.e.2.5 mmol/L K as K-sufficiency and 0.05 mmol/L K as K-deficiency.The results showed that,after 7 d or 13 d hydroponics,the seedlings of four genotypes were significantly different in K efficiency(defined as dry shoot weight under K deficiency)and responses of dry root weight,total root length,total surface area and total volume to K deficiency,but no consistent difference was found between short- and long-season cotton categories.And all the four genotypes exhibited a positive correlation between K efficiency and root biomass parameters(dry weight,total length and total surface area).At 13 DAT,K deficiency inhibited the fine root length and surface area more severely for two long-season genotypes(by 61.8%-75.5%)than for the short-season genotype BAIMIAN2(by only 47.7%-51.4%)compared to K sufficiency,but increased significantly the fine root length and surface area of short-season genotype CCRI50.Simultaneously,K deficiency also inhibited the medium root length and surface area more severely for two long-season genotypes(by 40.7%-53.9%)than for two short-season ones(by 18.0%-36.2%).With the prolongation of solution cultivation from 7 d to 13 d,the ratios of fine root length and surface area to total root length and surface area increased,and the ratios of medium root length and surface area to total root length and surface area decreased for both K sufficiency and K deficiency treatments.For K deficiency,the increasing rates of fine root length and surface area were significantly higher in short-season genotypes than in long-season ones.This suggested that the growth of fine root had different responses to K deficiency between short- and long-season genotypes.

Key words: Cotton, Maturity, K efficiency, Root

CLC Number:

HU Ze-bin, WANG Su-fang, ZHANG Xin, ZHANG Zhi-yong, DAI Hai-fang, WANG Qing-lian. Differences of Potassium Efficiency and Root Responses to Potassium Deficiency Between Short- and Long-season Cotton Genotypes[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2014, 29(5): 218-225. doi: 10.7668/hbnxb.2014.05.037.

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