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Titre du document / Document title

Sorghum and salinity: I. response of growth, water relations, and ion accumulation to NaCI salinity

Auteur(s) / Author(s)

NETONDO Godfrey Wafula (1) ; ONYANGO John Collins (1) ; BECK Erwin (2) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Department of Botany, Faculty of Science, Maseno University, P.O. Private Bag, Maseno, KENYA
(2) Department of Plant Physiology, University of Bayreuth, Universitätstrasse 30, 95440, Bayreuth, ALLEMAGNE

Résumé / Abstract

Crops grown in salt affected soils may suffer from drought stress, ion toxicity, and mineral deficiency leading to reduced growth and productivity. The present study was conducted to determine how salinity affects growth, water relations, and accumulation of cations of nutritional importance in various organs of grain sorghum [Sorghum bicolor (L.) Moench]. Two Kenyan sorghum varieties, Serena and Seredo, were grown in a greenhouse in quartz sand supplied with a complete nutrient solution to which 0 (control), 50, 100, 150, 200, and 250 mM NaCI was added. The 250 mM NaCl treatment significantly reduced the relative shoot growth rates, measured 25 d after the start of salt application, by 75 and 73%, respectively, for Serena and Seredo, and stem dry weight by 75 and 53%. In a similar way, young leaves were affected, with leaf blades of both varieties being reduced by 67% while sheaths were reduced by 83 and 87% for Serena and Seredo, respectively. Leaf water potential, osmotic potential, leaf pressure potential, and relative water content significantly declined with increasing salt stress. Roots and stems accumulated substantial amounts of sodium, saturating at 150 mM external NaCI. Accumulation of K+ and Ca2+ in the roots, stems, and leaves was strongly inhibited by salinity. Magnesium concentration of the roots was minimally impaired but that of the stems and leaves was strongly affected. Leaves continuously accumulated sodium, which was preferentially deposited in the sheaths. Mature leaves contained more Ca2+ and Mg2+ than young ones. The two sorghum varieties appear to sequester Na+ predominantly in roots, stems, leaf sheaths, and older leaf blades sparing the growing tissues as a salt tolerance mechanism. Nevertheless, greatly reduced concentrations of Ca2+, K+, and Mg2+ in leaves under salinity could cause cation deficiency which reduces plant growth.

Revue / Journal Title

Crop science    ISSN  0011-183X   CODEN CRPSAY 

Source / Source

2004, vol. 44, no3, pp. 797-805 [9 page(s) (article)] (40 ref.)

Langue / Language

Anglais

Editeur / Publisher

Crop Science Society of America, Madison, WI, ETATS-UNIS  (1961) (Revue)

Mots-clés anglais / English Keywords

Spermatophyta

;

Angiospermae

;

Monocotyledones

;

Gramineae

;

Salt

;

Growth rate

;

Shoot

;

Protected cultivation

;

Soils

;

Magnesium

;

Sodium chloride

;

Nutrient solution

;

Cations

;

Inorganic ion

;

Sorghum bicolor

;

Greenhouse

;

Grains

;

Organ

;

Deficiency

;

Toxicity

;

Stress

;

Drought

;

Water regime

;

Salinity

;

Mots-clés français / French Keywords

Spermatophyta

;

Angiospermae

;

Monocotyledones

;

Gramineae

;

Sel

;

Taux croissance

;

Pousse plante

;

Culture protégée

;

Sol

;

Magnésium

;

Sodium chlorure

;

Solution nutritive

;

Cation

;

Ion minéral

;

Sorghum bicolor

;

Serre

;

Grain

;

Organe

;

Déficit

;

Toxicité

;

Stress

;

Sécheresse

;

Régime hydrique

;

Salinité

;

Mots-clés espagnols / Spanish Keywords

Spermatophyta

;

Angiospermae

;

Monocotyledones

;

Gramineae

;

Sal

;

Tasa crecimiento

;

Brote planta

;

Cultivo protegido(invernadero)

;

Suelo

;

Magnesio

;

Sodio cloruro

;

Solución nutritive

;

Cation

;

Ión inorgánico

;

Sorghum bicolor

;

Invernadero

;

Grano

;

Organo

;

Déficiencia

;

Toxicidad

;

Estrés

;

Sequedad

;

Régimen hídrico

;

Salinidad

;

Localisation / Location

INIST-CNRS, Cote INIST : 1533, 35400011005601.0150

Nº notice refdoc (ud4) : 15764342



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