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Titolo:
Gas exchange by pods and subtending leaves and internal recycling of CO2 by pods of chickpea (Cicer arietinum L.) subjected to water deficits
Autore:
Ma, QF; Behboudian, MH; Turner, NC; Palta, JA;
Indirizzi:
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 Massey Univ, Inst Nat Resources, Palmerston North, New Zealand Massey Univ Palmerston North New Zealand Palmerston North, New Zealand
Titolo Testata:
JOURNAL OF EXPERIMENTAL BOTANY
fascicolo: 354, volume: 52, anno: 2001,
pagine: 123 - 131
SICI:
0022-0957(200101)52:354<123:GEBPAS>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
MEDITERRANEAN-TYPE ENVIRONMENT; COAT CELL TURGOR; CARBON; PLANT; GROWTH; SEEDS; WALL;
Keywords:
pod photosynthesis; leaf photosynthesis; CO2 recycling; respiration; C-13 labelling of pods;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
21
Recensione:
Indirizzi per estratti:
Indirizzo: Turner, NC CSIRO Plant Ind, Private Bag 5, Wembley, WA 6913, Australia CSIRO Plant Ind Private Bag 5 Wembley WA Australia 6913 stralia
Citazione:
Q.F. Ma et al., "Gas exchange by pods and subtending leaves and internal recycling of CO2 by pods of chickpea (Cicer arietinum L.) subjected to water deficits", J EXP BOT, 52(354), 2001, pp. 123-131

Abstract

Terminal drought markedly reduces leaf photosynthesis of chickpea (Cicer arietinum L.) during seed filling. A study was initiated to determine whether photosynthesis and internal recycling of CO2 by the pods can compensate for the low rate of photosynthesis in leaves under water deficits. The influence of water deficits on the rates of photosynthesis and transpiration of pods and subtending leaves in chickpea (cv. Sona) was investigated in two naturallylit, temperature-controlled glasshouses. At values of photosynthetically active radiation (PAR) of 900 mu mol m(-2) s(-1) and higher, the rateof net photosynthesis of subtending leaves of 10-d-old pods was 24 and 6 mu mol m(-2) s(-1) in the well-watered (WW) and water-stressed (WS) plants when the covered-leaf water potential (Vr) was -0.6 and -1.4 MPa, respectively. Leaf photosynthesis further decreased to 4.5 and 0.5 mu mol m(-2) s(-1)as Psi decreased to -2.3 and -3.3 MPa, respectively. At 900-1500 mu mol m(-2) s(1) PAR, the net photosynthetic rate of 10-d-old pods was 0.9-1.0 mu mol m(-2) s(-1) in the WW plants and was -0.1 to -0.8 mu mol m(-2) s(-1) in the WS plants. The photosynthetic rates of both pods and subtending leaves decreased with age, but the rate of transpiration of the pods increased with age. The rates of respiration and net photosynthesis inside the pods wereestimated by measuring the changes in the internal concentration of CO2 ofcovered and uncovered pods during the day. Both the WW and WS pods had similar values of internal net photosynthesis, but the WS pods showed significantly higher rates of respiration suggesting that the WS pods had higher gross photosynthetic rates than the WW pods, particularly in the late afternoon. When (CO2)-C-13 was injected into the gas space inside the pod, nearly 80%, of the labelled carbon 24 h after injection was observed in the pod wall in both the WW and WS plants. After 144 h the proportion of C-13 in the seed had increased from 19% to 32% in both treatments. The results suggest that internal recycling of CO2 inside the pod may assist in maintaining seed filling in water-stressed chickpea.

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Documento generato il 27/11/20 alle ore 07:28:48