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Titolo:
Remobilisation of carbon and nitrogen supports seed filling in chickpea subjected to water deficit
Autore:
Davies, SL; Turner, NC; Palta, JA; Siddique, KHM; Plummer, JA;
Indirizzi:
Univ Western Australia, Fac Agr, Nedlands, WA 6907, Australia Univ WesternAustralia Nedlands WA Australia 6907 nds, WA 6907, Australia CSIRO Plant Ind, Wembley, WA 6913, Australia CSIRO Plant Ind Wembley WA Australia 6913 nd, Wembley, WA 6913, Australia Univ Western Australia, Ctr Legumes Mediterranean Agr, Nedlands, WA 6907, Australia Univ Western Australia Nedlands WA Australia 6907 nds, WA 6907, Australia Agr Western Australia, Bentley, WA 6983, Australia Agr Western Australia Bentley WA Australia 6983 ntley, WA 6983, Australia
Titolo Testata:
AUSTRALIAN JOURNAL OF AGRICULTURAL RESEARCH
fascicolo: 7, volume: 51, anno: 2000,
pagine: 855 - 866
SICI:
0004-9409(2000)51:7<855:ROCANS>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
CICER-ARIETINUM-L; MEDITERRANEAN-TYPE ENVIRONMENT; SEASON GRAIN LEGUMES; PROTEIN-PRODUCTION; N-REDISTRIBUTION; MOISTURE STRESS; GAS-EXCHANGE; DRY-MATTER; GROWTH; YIELD;
Keywords:
assimilate; Cicer arietinum; dry matter partitioning;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Davies, SL CSIRO Plant Ind, GPO Box 1600, Canberra, ACT 2601, Australia CSIRO Plant Ind GPO Box 1600 Canberra ACT Australia 2601 tralia
Citazione:
S.L. Davies et al., "Remobilisation of carbon and nitrogen supports seed filling in chickpea subjected to water deficit", AUST J AGR, 51(7), 2000, pp. 855-866

Abstract

In the Mediterranean-type environment of south-western Australia, pod filling of chickpea occurs when net photosynthesis and nitrogen fixation is lowas a result of the onset of terminal drought. Remobilisation of carbon (C)and nitrogen (N) from vegetative parts to developing seed may be an important alternative source of C and N for seed filling. The contribution of stored pre-podding C and N to seed filling was studied by labelling the vegetative tissues with the stable isotopes, C-13 and N-15, prior to podding and following their subsequent movement to the seed. In ICCV88201, an advanced desi breeding line, 9% of the C and 67% of the N in the seed were derived from pre-podding C and N in well-watered plants compared with 13% of the seed C and 88% of the seed N in water-stressed plants. Furthermore, the contribution of pre-podding C and N was higher for earlier set compared with later set seeds. Pre-podding C and N were derived predominantly from the leaveswith relatively little from the stems, roots, and pod walls. Genotypic variation in remobilisation ability was identified in contrasting desi (Tyson)and kabuli (Kaniva) cultivars. In well-watered Tyson, 9% of the seed C and85% of the seed N were remobilised from vegetative tissues compared with 7% of the seed C and 62% of seed N in well-watered Kaniva. Water deficit decreased the amount of C remobilised by 3% in Tyson compared with 66% in Kaniva, whereas the total amount of N remobilised was decreased by 11% in Tysonand 48% in Kaniva. This was related to the maintenance of greater sink strength in Tyson, in which the number of filled pods was reduced by 66% in stressed plants compared with a 91% decrease in Kaniva. This indicates that better drought tolerance in desi genotypes is partly a consequence of betterremobilisation and higher pod number. These studies show that C and N assimilated prior to podding can supplement the supply of current assimilates to the filling seed in both well-watered and water-stressed chickpea. Remobilisation of pre-podding N is an essential source of N for seed filling irrespective of environmental stress.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/11/20 alle ore 21:48:45