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Titolo:
CHANGES IN THE PHOTOSYNTHETIC PROPERTIES OF AUSTRALIAN WHEAT CULTIVARS OVER THE LAST CENTURY
Autore:
WATANABE N; EVANS JR; CHOW WS;
Indirizzi:
ANU,RSBS,GPO BOX 475 CANBERRA ACT 2601 AUSTRALIA ANU,RSBS,GPO BOX 475 CANBERRA ACT 2601 AUSTRALIA GIFU UNIV,FAC AGR GIFU 50111 JAPAN CSIRO,DIV PLANT IND CANBERRA ACT 2601 AUSTRALIA
Titolo Testata:
Australian journal of plant physiology
fascicolo: 2, volume: 21, anno: 1994,
pagine: 169 - 183
SICI:
0310-7841(1994)21:2<169:CITPPO>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
LEAF GAS-EXCHANGE; RIBULOSE-1,5-BISPHOSPHATE CARBOXYLASE OXYGENASE; MEDITERRANEAN-TYPE ENVIRONMENT; CARBON ISOTOPE DISCRIMINATION; ELECTRON-TRANSPORT CAPACITIES; WATER-USE EFFICIENCY; THYLAKOID MEMBRANES; WINTER-WHEAT; PHOTOSYSTEM-II; FLAG LEAF;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
73
Recensione:
Indirizzi per estratti:
Citazione:
N. Watanabe et al., "CHANGES IN THE PHOTOSYNTHETIC PROPERTIES OF AUSTRALIAN WHEAT CULTIVARS OVER THE LAST CENTURY", Australian journal of plant physiology, 21(2), 1994, pp. 169-183

Abstract

A selection of Australian wheat cultivars, representative of those widely cultivated over the last century, was grown in the glasshouse. Photosynthetic properties of the flag leaves were determined as well as the chlorophyll, soluble protein. nitrogen and photosystem II content of the leaves. The rate of electron transport was calculated from gas exchange measurements at high CO2 partial pressures or from chlorophyll fluorescence. We found a trend towards higher rates Of CO2 assimilation, higher chlorophyll and nitrogen contents per unit leaf area over time. The increase in leaf nitrogen and photosynthetic rate is most probably due to the introduction of the Rht dwarfing genes. Counter to this we observed declines in rate of electron transport per unit chlorophyll, chlorophyll a/b ratio and photosystem II content per unit chlorophyll. Because the chlorophyll to nitrogen ratio was similar between cultivars, lowering of the rate of electron transport per unit chlorophyll in modern cultivars results in a fall in the rate of electron transport per unit of nitrogen. There was no variation in the ratio of intercellular to ambient CO2 partial pressures, or leaf mass per unit leaf area. The comparison of a near isogenic pair, with or without a portion of a rye chromosome that is associated with high yield, did not reveal any association with photosynthetic characteristics. It is suggested that selection for higher chlorophyll a/b ratios for a given leafchlorophyll content may provide a feasible surrogate for selecting higher photosynthetic capacity.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/11/20 alle ore 22:50:13