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Ontogeny Modifies the Effects of Water Stress on Stomatal Control, Leaf Area Duration and Biomass Partitioning of Pennisetum glaucum

Experiments are presented that test the relative importance, during ontogeny, of stomatal control and leaf area expansion to optimum seasonal water use in pearl millet (Pennisetum glaucum). These parameters play a key role in the compromise between plant growth and water saving under unpredictable c...

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Published in:The New phytologist 2001-01, Vol.149 (1), p.71-82
Main Authors: Winkel, T., Payne, W., J. -F. Renno
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Language:English
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description Experiments are presented that test the relative importance, during ontogeny, of stomatal control and leaf area expansion to optimum seasonal water use in pearl millet (Pennisetum glaucum). These parameters play a key role in the compromise between plant growth and water saving under unpredictable conditions of semiarid environments. The response of growth and water use of crops to successive 15 d drought periods was measured under field conditions in Niger (West Africa). From emergence to anthesis, biomass partitioning to stems and panicles depended strongly on leaf area development. Water use was linearly related to green leaf area duration in well watered plots, but was reduced proportionally more than green leaf area in drought-affected plots. The relations of crop growth rate and transpiration efficiency to leaf area depended on ontogenetic changes in biomass partitioning. In P. glaucum, stomata play a dominant role in reducing crop water use under preanthesis drought, although this control becomes negligible after anthesis because of ontogenetic decline in the range of stomatal conductance. The rate of leaf senescence after anthesis is not drought-dependent.
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Renno</creatorcontrib><title>Ontogeny Modifies the Effects of Water Stress on Stomatal Control, Leaf Area Duration and Biomass Partitioning of Pennisetum glaucum</title><title>The New phytologist</title><addtitle>New Phytol</addtitle><description>Experiments are presented that test the relative importance, during ontogeny, of stomatal control and leaf area expansion to optimum seasonal water use in pearl millet (Pennisetum glaucum). These parameters play a key role in the compromise between plant growth and water saving under unpredictable conditions of semiarid environments. The response of growth and water use of crops to successive 15 d drought periods was measured under field conditions in Niger (West Africa). From emergence to anthesis, biomass partitioning to stems and panicles depended strongly on leaf area development. 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Soil science and plant productions</subject><subject>Biodiversity and Ecology</subject><subject>Biological and medical sciences</subject><subject>biomass</subject><subject>biomass partitioning</subject><subject>Botanics</subject><subject>Cenchrus americanus</subject><subject>crop water balance</subject><subject>Dehydration</subject><subject>Drought</subject><subject>dry matter partitioning</subject><subject>duration</subject><subject>Economic plant physiology</subject><subject>Energy crops</subject><subject>Environmental Sciences</subject><subject>field experimentation</subject><subject>Flowering</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>growth analysis</subject><subject>inflorescences</subject><subject>intermittent drought</subject><subject>Leaf area</subject><subject>leaf area index</subject><subject>Life Sciences</subject><subject>Millet</subject><subject>Niger</subject><subject>ontogeny</subject><subject>Pearls</subject><subject>Pennisetum glaucum</subject><subject>Plants</subject><subject>seasonal variation</subject><subject>seedling emergence</subject><subject>semiarid tropics</subject><subject>semiarid zones</subject><subject>stems</subject><subject>stomata</subject><subject>Transpiration</subject><subject>Vegetal Biology</subject><subject>Water consumption</subject><subject>Water relations, transpiration, stomata</subject><subject>water stress</subject><subject>water‐use efficiency</subject><issn>0028-646X</issn><issn>1469-8137</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2001</creationdate><recordtype>article</recordtype><recordid>eNqNkk2P0zAQhi0EYrsL_wAhS0gIJBL8kTi2tJdSFopU2EqA4Ga5id11lcSL7SzbOz8ch5RyA3zxjP28M6OZAQBilGNUsJe7HBdMZBzTKicI4Rylw_PbO2B2_LgLZggRnrGCfT0BpyHsEiNKRu6DE0p5SUlRzMCPyz66re738L1rrLE6wHil4YUxuo4BOgO_qKg9_Bi9Dsnvk-U6FVULF66P3rUv4EorA-deK_h68CraBKm-ga9sApNmrXy046vtt2PAte57G3QcOrht1VAP3QNwz6g26IeH-wx8fnPxabHMVpdv3y3mq6wuMebZZsMF4k2jN6URG8OFolVNGyZ4hYQQVUFqxKnQSDFMWFPQCuuqrFHCDapKQc_A8ynulWrltbed8nvplJXL-Upa30hEaUUJYTc4sU8n9tq7b4MOUXY21LptVa_dEGQhCKNMsAQ--ytISpxaTTDn_4yJOUEco7FQPoG1dyF4bY7VYiTHDZA7OQ5ajoOW4wbIXxsgb5P08SHHsOl0cxT-HnkCnhwAFWrVGq_62oYjx0uR-pmo84n6blu9_-_08sN6mYwkfzTJdyE6_6cIzBkhgv4EQk3Tzw</recordid><startdate>20010101</startdate><enddate>20010101</enddate><creator>Winkel, T.</creator><creator>Payne, W.</creator><creator>J. -F. 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Psychology</topic><topic>growth analysis</topic><topic>inflorescences</topic><topic>intermittent drought</topic><topic>Leaf area</topic><topic>leaf area index</topic><topic>Life Sciences</topic><topic>Millet</topic><topic>Niger</topic><topic>ontogeny</topic><topic>Pearls</topic><topic>Pennisetum glaucum</topic><topic>Plants</topic><topic>seasonal variation</topic><topic>seedling emergence</topic><topic>semiarid tropics</topic><topic>semiarid zones</topic><topic>stems</topic><topic>stomata</topic><topic>Transpiration</topic><topic>Vegetal Biology</topic><topic>Water consumption</topic><topic>Water relations, transpiration, stomata</topic><topic>water stress</topic><topic>water‐use efficiency</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Winkel, T.</creatorcontrib><creatorcontrib>Payne, W.</creatorcontrib><creatorcontrib>J. -F. 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source Wiley-Blackwell Read & Publish Collection; JSTOR Archival Journals
subjects Agricultural sciences
Agronomy
Agronomy. Soil science and plant productions
Biodiversity and Ecology
Biological and medical sciences
biomass
biomass partitioning
Botanics
Cenchrus americanus
crop water balance
Dehydration
Drought
dry matter partitioning
duration
Economic plant physiology
Energy crops
Environmental Sciences
field experimentation
Flowering
Fundamental and applied biological sciences. Psychology
growth analysis
inflorescences
intermittent drought
Leaf area
leaf area index
Life Sciences
Millet
Niger
ontogeny
Pearls
Pennisetum glaucum
Plants
seasonal variation
seedling emergence
semiarid tropics
semiarid zones
stems
stomata
Transpiration
Vegetal Biology
Water consumption
Water relations, transpiration, stomata
water stress
water‐use efficiency
title Ontogeny Modifies the Effects of Water Stress on Stomatal Control, Leaf Area Duration and Biomass Partitioning of Pennisetum glaucum
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