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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 imposition of treatments (Day 0=78 DAS) in (A) seed biomass, (B) above-ground vegetative biomass (sum of leaf, pod, and stem), and (C) root biomass of Rupali and Almaz chickpeas in well-watered (WW) and water-stressed (WS) treatments in Experiment 1. Values are means ±SE (n=4).
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fig10: Change with time after imposition of treatments (Day 0=78 DAS) in (A) seed biomass, (B) above-ground vegetative biomass (sum of leaf, pod, and stem), and (C) root biomass of Rupali and Almaz chickpeas in well-watered (WW) and water-stressed (WS) treatments in Experiment 1. Values are means ±SE (n=4).

Mentions: Compared with Rupali, Almaz tended to allocate more resources to vegetative growth (both above- and below-ground) than to reproductive growth (Fig. 10). In Experiment 1, the seed yield in the WW treatment was 12.3±0.31 g−1 plant in Rupali and 7.45±0.56 g−1 plant in Almaz (Table 1); the corresponding values in the WS treatment were 4.05±0.51 and 1.12±0.59 g−1 plant, a decrease of about 67% in Rupali and 85% in Almaz (Table 1). When seeds were separated into those from flowers formed before and after WS was imposed, seed yield in the WW treatment after WS was imposed was 1.62±0.29 g−1 plant in Rupali and 3.22±0.59 g−1 plant in Almaz; corresponding values in the WS treatment were 0±0.00 and 0.28±0.08 g−1 plant in Rupali and Almaz (Table 1), a decrease of 100% and 91% in Rupali and Almaz, respectively (Table 1). In Experiment 2, seed yield of Rupali in the WW treatment was less than that of Experiment 1 due to the smaller plants produced in summer, but in the WS treatment seed yield was similar in both experiments (Table 2).


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 imposition of treatments (Day 0=78 DAS) in (A) seed biomass, (B) above-ground vegetative biomass (sum of leaf, pod, and stem), and (C) root biomass of Rupali and Almaz chickpeas in well-watered (WW) and water-stressed (WS) treatments in Experiment 1. Values are means ±SE (n=4).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig10: Change with time after imposition of treatments (Day 0=78 DAS) in (A) seed biomass, (B) above-ground vegetative biomass (sum of leaf, pod, and stem), and (C) root biomass of Rupali and Almaz chickpeas in well-watered (WW) and water-stressed (WS) treatments in Experiment 1. Values are means ±SE (n=4).
Mentions: Compared with Rupali, Almaz tended to allocate more resources to vegetative growth (both above- and below-ground) than to reproductive growth (Fig. 10). In Experiment 1, the seed yield in the WW treatment was 12.3±0.31 g−1 plant in Rupali and 7.45±0.56 g−1 plant in Almaz (Table 1); the corresponding values in the WS treatment were 4.05±0.51 and 1.12±0.59 g−1 plant, a decrease of about 67% in Rupali and 85% in Almaz (Table 1). When seeds were separated into those from flowers formed before and after WS was imposed, seed yield in the WW treatment after WS was imposed was 1.62±0.29 g−1 plant in Rupali and 3.22±0.59 g−1 plant in Almaz; corresponding values in the WS treatment were 0±0.00 and 0.28±0.08 g−1 plant in Rupali and Almaz (Table 1), a decrease of 100% and 91% in Rupali and Almaz, respectively (Table 1). In Experiment 2, seed yield of Rupali in the WW treatment was less than that of Experiment 1 due to the smaller plants produced in summer, but in the WS treatment seed yield was similar in both experiments (Table 2).

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