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Flower numbers, pod production, pollen viability, and pistil function are reduced and flower and pod abortion increased in chickpea (Cicer arietinum L.) under terminal drought.

Fang X, Turner NC, Yan G, Li F, Siddique KH - J. Exp. Bot. (2009)

Bottom Line: Compared to well-watered (WW) controls, the WS treatment reduced flower production by about two-thirds.In the WW treatment, about 15% of the flowers aborted and 42% (Rupali) and 67% (Almaz) of the pods aborted, whereas in the WS treatment 37% and 56% of the flowers aborted and 54% and 73% of the pods aborted, resulting in seed yields of 33% and 15% of the yields in WW plants in Rupali and Almaz, respectively.It is concluded that, in addition to pod abortion, flower abortion is an important factor limiting yield in chickpea exposed to terminal drought and that water deficit impaired the function of the pistil/style more than the pollen.

View Article: PubMed Central - PubMed

Affiliation: Centre for Legumes in Mediterranean Agriculture, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia.

ABSTRACT
Terminal drought during the reproductive stage is a major constraint to yield of chickpea in many regions of the world. Termination of watering (WS) during podding in a small-seeded desi chickpea (Cicer arietinum L.) cultivar, Rupali, and a large-seeded kabuli chickpea cultivar, Almaz, induced a decrease in predawn leaf water potential (LWP), in the rate of photosynthesis, and in stomatal conductance. Compared to well-watered (WW) controls, the WS treatment reduced flower production by about two-thirds. In the WW treatment, about 15% of the flowers aborted and 42% (Rupali) and 67% (Almaz) of the pods aborted, whereas in the WS treatment 37% and 56% of the flowers aborted and 54% and 73% of the pods aborted, resulting in seed yields of 33% and 15% of the yields in WW plants in Rupali and Almaz, respectively. In vitro pollen viability and germination in Rupali decreased by 50% and 89% in the WS treatment, and pollen germination decreased by 80% in vivo when pollen from a WS plant was placed on a stigma of a WW plant. While about 37% of the germinated pollen tubes from WW plants and 22% from the WS plants reached the ovary in the WW plants, less than 3% of pollen grains reached the ovary when pollen from either WS or WW plants was placed on a stigma of a WS plant. It is concluded that, in addition to pod abortion, flower abortion is an important factor limiting yield in chickpea exposed to terminal drought and that water deficit impaired the function of the pistil/style more than the pollen.

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Related in: MedlinePlus

Change with time after the imposition of treatments [Day 0=78 DAS (12 August) in A and B and 39 DAS (1 February) in C and D] in soil water content [SWC, % of field capacity (FC)] (A, C), and predawn leaf water potential (LWP) (B, D) of Rupali and Almaz chickpea cultivars in Experiment 1 (A, B) and in Rupali in Experiment 2 (C, D) in well-watered (WW) and water-stressed (WS) treatments. Values are means ±SE (n=5). Note change of scale of y-axis between (B) and(D).
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fig1: Change with time after the imposition of treatments [Day 0=78 DAS (12 August) in A and B and 39 DAS (1 February) in C and D] in soil water content [SWC, % of field capacity (FC)] (A, C), and predawn leaf water potential (LWP) (B, D) of Rupali and Almaz chickpea cultivars in Experiment 1 (A, B) and in Rupali in Experiment 2 (C, D) in well-watered (WW) and water-stressed (WS) treatments. Values are means ±SE (n=5). Note change of scale of y-axis between (B) and(D).

Mentions: In Experiment 1, SWC decreased after water was withheld (DAW) from the WS treatment to reach 39% FC by 3 DAW and 24% FC by 7 DAW. Subsequently SWC decreased slowly to reach 14% FC by 23 DAW (Fig. 1A). LWP in WW plants was between –0.4 and –0.7 MPa in both cultivars, but in WS plants it decreased steadily to about –3.2 MPa by 17 DAW in both cultivars. At 23 DAW, LWP of Rupali was not measured, but Almaz had decreased to –5.0 MPa (Fig. 1B). In Experiment 2, SWC in the WS treatment decreased more slowly than in Experiment 1 to reach 27% FC by 13 DAW (Fig. 1C), while LWP decreased significantly below that in the WW treatment about 7–9 DAW in both experiments (Fig. 1B, D).


Flower numbers, pod production, pollen viability, and pistil function are reduced and flower and pod abortion increased in chickpea (Cicer arietinum L.) under terminal drought.

Fang X, Turner NC, Yan G, Li F, Siddique KH - J. Exp. Bot. (2009)

Change with time after the imposition of treatments [Day 0=78 DAS (12 August) in A and B and 39 DAS (1 February) in C and D] in soil water content [SWC, % of field capacity (FC)] (A, C), and predawn leaf water potential (LWP) (B, D) of Rupali and Almaz chickpea cultivars in Experiment 1 (A, B) and in Rupali in Experiment 2 (C, D) in well-watered (WW) and water-stressed (WS) treatments. Values are means ±SE (n=5). Note change of scale of y-axis between (B) and(D).
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC2803204&req=5

fig1: Change with time after the imposition of treatments [Day 0=78 DAS (12 August) in A and B and 39 DAS (1 February) in C and D] in soil water content [SWC, % of field capacity (FC)] (A, C), and predawn leaf water potential (LWP) (B, D) of Rupali and Almaz chickpea cultivars in Experiment 1 (A, B) and in Rupali in Experiment 2 (C, D) in well-watered (WW) and water-stressed (WS) treatments. Values are means ±SE (n=5). Note change of scale of y-axis between (B) and(D).
Mentions: In Experiment 1, SWC decreased after water was withheld (DAW) from the WS treatment to reach 39% FC by 3 DAW and 24% FC by 7 DAW. Subsequently SWC decreased slowly to reach 14% FC by 23 DAW (Fig. 1A). LWP in WW plants was between –0.4 and –0.7 MPa in both cultivars, but in WS plants it decreased steadily to about –3.2 MPa by 17 DAW in both cultivars. At 23 DAW, LWP of Rupali was not measured, but Almaz had decreased to –5.0 MPa (Fig. 1B). In Experiment 2, SWC in the WS treatment decreased more slowly than in Experiment 1 to reach 27% FC by 13 DAW (Fig. 1C), while LWP decreased significantly below that in the WW treatment about 7–9 DAW in both experiments (Fig. 1B, D).

Bottom Line: Compared to well-watered (WW) controls, the WS treatment reduced flower production by about two-thirds.In the WW treatment, about 15% of the flowers aborted and 42% (Rupali) and 67% (Almaz) of the pods aborted, whereas in the WS treatment 37% and 56% of the flowers aborted and 54% and 73% of the pods aborted, resulting in seed yields of 33% and 15% of the yields in WW plants in Rupali and Almaz, respectively.It is concluded that, in addition to pod abortion, flower abortion is an important factor limiting yield in chickpea exposed to terminal drought and that water deficit impaired the function of the pistil/style more than the pollen.

View Article: PubMed Central - PubMed

Affiliation: Centre for Legumes in Mediterranean Agriculture, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia.

ABSTRACT
Terminal drought during the reproductive stage is a major constraint to yield of chickpea in many regions of the world. Termination of watering (WS) during podding in a small-seeded desi chickpea (Cicer arietinum L.) cultivar, Rupali, and a large-seeded kabuli chickpea cultivar, Almaz, induced a decrease in predawn leaf water potential (LWP), in the rate of photosynthesis, and in stomatal conductance. Compared to well-watered (WW) controls, the WS treatment reduced flower production by about two-thirds. In the WW treatment, about 15% of the flowers aborted and 42% (Rupali) and 67% (Almaz) of the pods aborted, whereas in the WS treatment 37% and 56% of the flowers aborted and 54% and 73% of the pods aborted, resulting in seed yields of 33% and 15% of the yields in WW plants in Rupali and Almaz, respectively. In vitro pollen viability and germination in Rupali decreased by 50% and 89% in the WS treatment, and pollen germination decreased by 80% in vivo when pollen from a WS plant was placed on a stigma of a WW plant. While about 37% of the germinated pollen tubes from WW plants and 22% from the WS plants reached the ovary in the WW plants, less than 3% of pollen grains reached the ovary when pollen from either WS or WW plants was placed on a stigma of a WS plant. It is concluded that, in addition to pod abortion, flower abortion is an important factor limiting yield in chickpea exposed to terminal drought and that water deficit impaired the function of the pistil/style more than the pollen.

Show MeSH
Related in: MedlinePlus