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Titolo:
Influence of root chilling on winter and spring wheat growth and carbon dioxide assimilation
Autore:
Al-Hamdani, SH; Thomas, TS;
Indirizzi:
Jacksonville State Univ, Dept Biol, Jacksonville, AL 36265 USA Jacksonville State Univ Jacksonville AL USA 36265 ksonville, AL 36265 USA
Titolo Testata:
ACTA AGRICULTURAE SCANDINAVICA SECTION B-SOIL AND PLANT SCIENCE
fascicolo: 3-4, volume: 50, anno: 2001,
pagine: 149 - 154
SICI:
0906-4710(200112)50:3-4<149:IORCOW>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
SUCROSE PHOSPHATE SYNTHASE; FRUCTAN METABOLISM; LOW-TEMPERATURE; STARCH ACCUMULATION; COLD-ACCLIMATION; ACID INVERTASE; PHOTOSYNTHESIS; LEAVES; BARLEY; SHOOT;
Keywords:
acid invertase; carbohydrate; photosynthesis; sucrose phosphate synthase; sucrose synthase; Triticum aestivum L.;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
36
Recensione:
Indirizzi per estratti:
Indirizzo: Al-Hamdani, SH Jacksonville State Univ, Dept Biol, Jacksonville, AL 36265 USA Jacksonville State Univ Jacksonville AL USA 36265 6265 USA
Citazione:
S.H. Al-Hamdani e T.S. Thomas, "Influence of root chilling on winter and spring wheat growth and carbon dioxide assimilation", ACT AG SC B, 50(3-4), 2001, pp. 149-154

Abstract

Growth and carbon dioxide (CO2) assimilation responses of winter wheat (Triticum aestivum L. var. Chisholm) and spring wheat (var. Mexico 82) to rootchilling were compared and contrasted. Seedlings were grown in a growth chamber at 350 mu mol m(-2) s(-1) photon flux density, 45-50% relative humidity and 25 degreesC for 4 weeks. The root-zone temperature of the experimental plants was then lowered from 25 to 5 degreesC for 7 days with the shootsremaining at a constant 25 degreesC. Soluble sugar, starch and fructan concentrations were determined to understand the physiological bases of the effects of these conditions on the two varieties. In addition, activities of sucrose phosphate synthase (SPS), sucrose synthase (SS) and acid invertase were examined. The effects of root chilling on leaf conductance and internal CO2 were also investigated. Growth of both plant varieties decreased at the lower root-zone temperature, but this reduction was most pronounced in the spring wheat. Both varieties showed significant reductions in CO2 assimilation, leaf conductance and internal CO2 concentration in response to lower root-zone temperatures. Total soluble sugar, starch and fructan concentrations in the shoots and roots increased in both varieties at the 5 degreesCroot-zone. In addition, sucrose concentration in the shoots of the plants exposed to lower root-zone temperatures increased significantly in both varieties. Invertase and SPS activity decreased in the shoots of both varieties at a low root-zone temperature, whereas SS activity increased in the shoots of both varieties.

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Documento generato il 09/07/20 alle ore 20:58:28