Effect of Post-anthesis Drought on Cell Division and Starch Accumulation in Developing Wheat Grains

Nicolas, Marc E.; Gleadow, Roslyn M.; Dalling, Michael J.

doi:10.1093/oxfordjournals.aob.a086922

Cited by 121 publications

(79 citation statements)

References 18 publications

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“…Moreover, our results indicate that landraces from areas with high ET 0 during grain filling had a lower grain filling rate and lighter grains. This finding is consistent with the close relationship between grain weight and filling rate in durum wheat (Motzo et al 1996), and the reduction in grain filling rate (Nicolas et al 1985) and grain weight (Egli 1998;Royo et al 2000) caused by drought in grain crops. The shorter grain filling duration of the landraces from northern areas was compensated by a higher rate, thus leading to heavier grains.…”

Section: Discussionsupporting

confidence: 88%

The climate of the zone of origin of Mediterranean durum wheat (Triticum durum Desf.) landraces affects their agronomic performance

Royo

Nazco

Villegas

2014

Genet Resour Crop Evol

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The genetic diversity of durum wheat (Triticum durum Desf.) is held by landraces, which are generally considered to be endemic to a particular region to which they are well adapted. To evaluate the effect of climate in the countries of origin on their agronomic performance, 172 durum wheat landraces from 21 Mediterranean countries were grown in northeastern Spain. Average long-term climatic data of the main wheat-growing areas in each country of origin allowed us to identify four climatic zones in the Mediterranean Basin, steadily varying from warm and dry to cool and wet. The phenology, biomass, and yield of landraces were affected by the climatic zone of origin. The climatic zone accounted for 32.8, 28.3 and 14.5 % of variance for days to anthesis, plant height, and grain filling rate, respectively. The number of days to heading and anthesis steadily increased when moving from the warmest and driest zone of origin to the coldest and wettest one. Landraces collected in the warmest and driest zone had a smaller biomass, a lower chlorophyll content in the flag leaf, more fertile tillers, spikes and grains m -2 , a lower grain filling rate, lighter grains, and lower yields than those originated in colder and wetter zones. Landraces collected in countries with high solar radiation showed a shorter cycle until anthesis and smaller height and biomass accumulation, while higher temperatures after anthesis resulted in more tillers and spikes. Landraces from countries with high potential evapotranspiration during grain filling had significantly lower grain filling rates and grain weight.

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Section: Discussionsupporting

confidence: 88%

The climate of the zone of origin of Mediterranean durum wheat (Triticum durum Desf.) landraces affects their agronomic performance

Royo

Nazco

Villegas

2014

Genet Resour Crop Evol

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“…Decreases in final kernel mass in response to environmental stresses have correlated well with decreases in endosperm cell number in maize (14), as well as in other cereal grain species (5,18,19). Perhaps in the present case also, the ABA-induced decrease in endosperm cell number limited the maximal storage capacity of the kernel, and in tum, decreased the mature dry mass (Table II), even though fresh weight growth and starch granule initiation were relatively unaffected.…”

Section: Discussionsupporting

confidence: 60%

“…Starch granule number, an indirect measure of the number of amyloplasts in the endosperm, has correlated with final kernel mass in several cereal grain species, including maize (14), wheat (18,19), and barley (5). In the present studies, culturing kernels on medium containing ABA had no apparent effect on the number of starch granules per endosperm during the period of most rapid starch granule initiation (ABA treatment from 11 DAP, Fig.…”

Section: Discussionsupporting

confidence: 41%

“…Both cell division and cell expansion may be important in determining the storage capacity of the kernel. Water or I temperature stress during early kernel development decreases the number of endosperm cells and starch granules (5,14,18,19) and also decreases dry matter accumulation (18,28). Since ABA accumulates in plant tissues subjected to water deficit and other types of stress, it is plausible that the effects of water deficit on kernel development may be due, in part, to elevated levels of ABA in the kernel.…”

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confidence: 99%

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Abscisic Acid Inhibition of Endosperm Cell Division in Cultured Maize Kernels

Myers¹,

Setter²,

Madison³

et al. 1990

Plant Physiol.

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The response of developing maize (Zea mays L.) endosperm to elevated levels of abscisic acid (ABA) was investigated. Maize kernels and subtending cob sections were excised at 5 days after pollination (DAP) and placed in culture with or without 90 micromolar (±)-ABA in the medium. A decreased number of cells per endosperm was observed at 10 DAP (and later sampling times) in kernels cultured in medium containing ABA from 5 DAP, and in kernels transferred at 8 DAP to medium containing ABA, but not in kernels transferred at 11 DAP to medium containing ABA. The number of starch granules per endosperm was decreased in some treatments, but the reduction, when apparent, was comparable to the decreased number of endosperm cells. The effect on endosperm fresh weight was slight, transient, and appeared to be secondary to the effect on cell number. Mature endosperm dry weight was reduced when kemels were cultured continuously in medium containing ABA. Endosperm (+)-ABA content of kernels cultured in 0, 3, 10, 30, 100, or 300 micromolar (±)-ABA was measured at 10 DAP by indirect ELISA using a monoclonal antibody. Content of (+)-ABA in endosperms correlated negatively (R = -0.92) with endosperm cell number. On the basis of these studies we propose that during early kernel development, elevated levels of ABA decrease the rate of cell division in maize endosperm which, in turn, could limit the storage capacity of the kernel.

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“…Drought stress during early seed development reduces the rate of grain filling, induces early senescence and shortens the grain-filling and ripening period by 10 days (Nicolas et al 1985;Westgate 1994). The process of grain-filling is supported by carbohydrate mobilisation from the stem of the plant.…”

Section: Drought Stressmentioning

confidence: 99%

Yield stability for cereals in a changing climate

Powell

Ravash

et al. 2012

Functional Plant Biol.

133

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Abstract. The United Nations Food and Agriculture Organisation (FAO) forecasts a 34% increase in the world population by 2050. As a consequence, the productivity of important staple crops such as cereals needs to be boosted by an estimated 43%. This growth in cereal productivity will need to occur in a world with a changing climate, where more frequent weather extremes will impact on grain productivity. Improving cereal productivity will, therefore, not only be a matter of increasing yield potential of current germplasm, but also of improving yield stability through enhanced tolerance to abiotic stresses. Successful reproductive development in cereals is essential for grain productivity and environmental constraints (drought, cold, frost, heat and waterlogging) that are associated with climate change are likely to have severe effects on yield stability of cereal crops. Currently, genetic gains conferring improved abiotic stress tolerance in cereals is hampered by the lack of reliable screening methods, availability of suitable germplasm and poor knowledge about the physiological and molecular underpinnings of abiotic stress tolerance traits.

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Effect of Post-anthesis Drought on Cell Division and Starch Accumulation in Developing Wheat Grains

Cited by 121 publications

References 18 publications

The climate of the zone of origin of Mediterranean durum wheat (Triticum durum Desf.) landraces affects their agronomic performance

The climate of the zone of origin of Mediterranean durum wheat (Triticum durum Desf.) landraces affects their agronomic performance

Abscisic Acid Inhibition of Endosperm Cell Division in Cultured Maize Kernels

Yield stability for cereals in a changing climate

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