Salt tolerance screening in six maize (Zea mays L.) genotypes using multivariate cluster analaysis
2010
Chaum, S. | Kirdmanee, C., National Science and Technology Development Agency, 113 Thailand Science Park, Paholyothin Road, Klong 1, Klong Luang, Pathumthani 12120 (Thailand). National Center for Genetic Engineering and Biotechnology
The effective indices for salt tolerant classification of maize genotypes were investigated. Six maize cultivars were treated with either 0 (control) on 200 mM NaCl (salt stress). Chlorophyll a (chl sub a), chlorophyll b (chl sub b), total chlorophyll (TC) and total carotenoid (C sub x+c) concentrations in the salt-stressed leaves dropped significantly. Chl sub a degradation in maize genotypes was correlated with maximum quantum yield of PS11 (F sub v/F sub m). TC content was positively related to photon yield of PS 11 (phi sub PS11). F sub v/F sub m, phi sub PS11 and phytochemical quenching (qP) in the salt-stressed leaves decreased dramatically, related to the reduced net photosynthetic rate (P sub n), leading to growth reduction. The chlorophyll a fluorescence parameters, F sub v/F sub m, phi sub PS11 and qP, in the leaf tissues decreased, while non-photochemical quenching (NPQ) increased. Data relating to pigment degradation, chlorophyll a fluorescence diminution, photosynthesis reduction and growth inhibition in salt-stress maize cultivars were subjected to hierarchical cluster analysis using SPSS software. Two classes of genotypes were identified: salt-tolerant (waxy 1, waxy 2 and waxy 3) and salt-sensitive (Honey, Sweet 1 and Sweet 2).
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