Salt tolerance screening in six maize (Zea mays L.) genotypes using multivariate cluster analysis

Issue Date

6-2010

Abstract

The effective indices for salt tolerant classification of maize genotypes were investigated. Six maize cultivars were treated with either 0 (control) or 200 mM NaCl (salt stress). Chlorophyll a (Chl a), chlorophyll b (Chl b), total chlorophyll (TC) and total carotenoid (C x+c) concentrations in the salt-stressed leaves dropped significantly. Chl a degradation in maize genotypes was correlated with maximum quantum yield of PSII (F v/F m). TC content was positively related to photon yield of PSII (Φ PSII). F v/F m, Φ PSII and photochemical quenching (qP) in the salt-stressed leaves decreased dramatically, related to the reduced net photosynthetic rate (P n), leading to growth reduction. The chlorophyll a fluorescence parameters, F v/F m, Φ PSII 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-stressed 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).

Source or Periodical Title

Philippine Agricultural Scientist, The (Formerly: The Philippine Agriculturist)

ISSN

0031-7454

Volume

93

Issue

2

Page

156-164

Document Type

Article

College

College of Agriculture and Food Science (CAFS)

Frequency

quarterly

Physical Description

graphs ; tables ; references

Language

English

Subject

growth reduction, hierarchical cluster analysis, net photosynthetic rate, pigment degradation

En – AGROVOC descriptors

ZEA MAYS; MAIZE; SALINE SOILS; OSMOTIC STRESS; SALT TOLERANCE; GROWTH CONTROL; PLANT GROWTH; PHOTOSYNTHESIS; CHLOROPHYLL A; PIGMENTS

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