Phenology and leaf-area development in a tropical grain sorghum

Muchow, R.C.; Carberry, P. S.

doi:10.1016/0378-4290(90)90056-h

Cited by 82 publications

(52 citation statements)

References 17 publications

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“…Isso indica que a temperatura do ar foi o principal fator ambiental que determinou a emissão de folhas na calêndula. Estes resultados concordam com aqueles obtidos por outros pesquisadores que mostraram que o número de folhas é linearmente relacionado com o acúmulo de unidades térmicas desde a emergência da plântula (BAKER et al, 1986;MUCHOW & CARBERRY, 1990;SLAFER et al, 1994).…”

Section: Resultsunclassified

Estimativa do filocrono em calêndula

et al. 2008

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O objetivo deste trabalho foi estimar o filocrono em plantas de calêndula (Calendula officinalis L.) cultivadas em diferentes épocas de semeaduras. Realizaram-se três épocas de semeaduras: 06/04/2005, 23/06/2005 e 03/10/2006, no interior de uma estufa plástica com área de 240m2, instalada no campus da Universidade Federal de Santa Maria, UFSM. A semeadura foi realizada em vasos plásticos com capacidade volumétrica para cinco litros. O delineamento experimental foi inteiramente casualizado com 320 vasos em cada época, sendo distribuído em quatro fileiras de 80 vasos cada. Em uma planta de oito vasos de cada quatro fileiras, fez-se a contagem, semanalmente, do número de folhas emergidas da haste principal e na primeira haste lateral. Os dados do número de folhas foram correlacionados com a soma térmica diária acumulada, considerando-se uma temperatura base de 8°C. Constatou-se que o filocrono variou com a época de semeadura, sendo o menor valor igual 15,9°C dia folha-1, obtido na 2ª época de semeadura e o maior, igual a 24,5°C dia folha-1, na 1ª época na haste principal e 48,9°C dia folha-1 na semeadura de outubro na primeira haste lateral.

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Section: Resultsunclassified

Estimativa do filocrono em calêndula

et al. 2008

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“…Leaf area of each individual fully expanded leaf was estimated non-destructively from the product of its length, greatest width, and a shape factor of 0.57, which was established by regressing the product of width and length of a leaf against its actual leaf area measured destructively at the end of the experiment. These estimates of individual leaf sizes, combined with weekly observations of fully expanded and senesced leaves, allowed the estimation of weekly green leaf area (Muchow and Carberry, 1990). At the time of the destructive harvest at the end of the experiment, leaf area of every remaining green leaf was measured with an electronic planimeter (DIAS image analysis system, Delta-T Devices Ltd., Cambridge, UK).…”

Section: Leaf Measurementsmentioning

confidence: 99%

Bigger is not always better: Reducing leaf area helps stay-green sorghum use soil water more slowly

George‐Jaeggli

Mortlock

Borrell

2017

Environmental and Experimental Botany

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A B S T R A C TStay-green, a trait that confers delayed leaf senescence and improved grain yield under post-anthesis drought, has been associated with smaller canopies at flowering and increased water uptake during the post-flowering period. It has been shown that the main stay-green quantitative trait loci reduce leaf area via reduced tiller number and smaller leaves. To show that these canopy characteristics are directly linked to water savings, we grew near-isogenic lines with and without stay-green introgressions in large lysimeter pots and measured their weekly pre-anthesis water use and main-stem and tiller leaf area. Paradoxically, age-related senescence of lower leaves in stay-green lines was accelerated before flowering, contributing to their smaller leaf area at flowering. This process of reducing leaf area by shedding old leaves lower in the canopy, has not previously been described for the stay-green introgressions. We found that tiller leaf area rather than transpiration efficiency, or transpiration per leaf area, was the main driver of weekly transpiration and the reduced pre-flowering water use in stay-green lines. In soils with good water-holding capacity, any water savings during the pre-anthesis period increases water availability during the post-anthesis period, therefore allowing plants to retain photosynthetic capacity for longer by "staying green" during grain filling.Crown

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“…Heat units can be expressed as growing degree-days (GDD) or *Corresponding author; fax +82-2-873-2056 e-mail sjeenv@snu.ac.kr growing degree units (GDU), and are frequently used to describe the timing of biological processes (McMaster and Wilhelm, 1997). Leaf number can be either linearly related to the accumulation of thermal units (~ d) from the onset of seedling emergence (Warrington and Kanemasu, 1983;Dwyer and Stewart, 1986;Muchow and Carberry, 1990;Slafer et al, 1994) or nonlinearly related (Faust and Heins, 1993;Yin and Kropff, 1996;NeSmith, 1997). Whereas the effect of temperature on leaf number has been extensively researched in grain crops, very little information is available for most vegetable species (NeSmith, 1997).…”

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confidence: 99%

Estimation of leaf number and leaf area of hydroponic pak-choi plants (Brassica campestns ssp,chinensis) using growing degree-days

Cho

Son

2007

J. Plant Biol.

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Temperature is a principal environmental factor that directly affects the growth and timing of appearance for crop leaves. To estimate the leaf number and leaf area of 'Seoul' pak-choi plants (Brassica campestris ssp. chinensis), we applied the concept of growing degree-days {GDD = (Tavg-Tbase)X days), where Tavg , Tbase, and days were the daily average air temperature, base temperature, and days after transplanting, respectively. Leaves that were beginning to unfold with a leaf area >1 cm 2 were counted every 2

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Phenology and leaf-area development in a tropical grain sorghum

Cited by 82 publications

References 17 publications

Estimativa do filocrono em calêndula

Estimativa do filocrono em calêndula

Bigger is not always better: Reducing leaf area helps stay-green sorghum use soil water more slowly

Estimation of leaf number and leaf area of hydroponic pak-choi plants (Brassica campestns ssp,chinensis) using growing degree-days

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