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Hafid, R. El; Smith, Dan H.; Karrou, Mohammed; Samir, Karima

doi:10.1023/a:1018301721981

Cited by 31 publications

(2 citation statements)

References 24 publications

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“…ESD reduced the root: shoot ratio at anthesis, regardless of the size of the root system. The reduction in root biomass at anthesis in the ESD treatment could be explained by the delay in the appearance of tillers [10], since root biomass and tiller number are close related [37]. In the vegetative stage during water deficit, wheat plants invest more in root biomass than shoot biomass [34,38].…”

Section: Discussionmentioning

confidence: 99%

“…While seedlings subjected to ESD often survive [6], their growth and development are significantly slowed, which delays anthesis and reduces biomass and grain yield [7]. ESD reduces the rate of leaf net photosynthesis, tiller number, leaf area, aboveground biomass and grain yield [8,9,10] as well as below ground traits, such as, total root length and root surface area, increases the root: shoot ratio [11].…”

Section: Introductionmentioning

confidence: 99%

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Early Season Drought Largely Reduces Grain Yield in Wheat Cultivars with Smaller Root Systems

Figueroa-Bustos

Palta

Chen

et al. 2019

Plants

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In the Australian grainbelt, early winter rainfall has declined during the last 30 years, and farmers sow their crops dry, increasing the risk of early season drought. This study aimed to examine whether differences in the root systems were associated with tolerance to early season drought. Three wheat cultivars with different root systems were grown in 1 m columns in a glasshouse. Immediately after sowing in dry soil, 440 mL water (equivalent to 25 mm rainfall) was supplied to each column, and no water was added to induce the early-season drought for the next 30 days. Shoot and root traits were measured at the end of the early season drought, anthesis and at maturity, respectively. The restricted water supply reduced Ψleaf, stomatal conductance, leaf photosynthetic rate, shoot and root biomass. Early season drought delayed phenology in all cultivars, but there was recovery of root and shoot biomass at anthesis in all three cultivars. Leaf area and shoot biomass at anthesis in Bahatans-87 (large root system) recovered better than Tincurrin (small root system). At maturity, early season drought reduced grain yield more in Tincurrin than Bahatans-87. The slow phenology of Bahatans-87 allowed greater recovery after the drought in leaf area and shoot biomass, which may explain the smaller reduction in grain yield after early season drought.

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