Elongation rate of sorghum leaves has a common response to meristem temperature in diverse African and European environmental conditions

Lafarge, Tanguy; Raı̈ssac, Marcel De; Tardieu, François

doi:10.1016/s0378-4290(98)00085-9

Cited by 33 publications

(34 citation statements)

References 29 publications

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“…The absolute elongation rate is then constant with time and is common for all leaves (except for the first five leaves). Similar results are conserved in sorghum (Lafarge et al, 1998). The duration of the period with linear elongation is short by comparison with that of leaf development (1\3 of total development duration in the experiment presented in Fig.…”

Section: Time Course Of Leaf Expansion and Epidermal Cell Division Insupporting

confidence: 74%

“…This is also the case for pea under water deficit (Turc & Lecoeur, 1997) and for maize or sorghum exposed to a large range of PPFD (Lafarge et al, 1998 ;Muller et al, unpublished). Only drastic reductions in incident PPFD (lower than 2 mol m −# d −" ) or in water availability (leaf predawn water potential lower than k1 MPa) increased these durations (C. Granier & F. Tardieu, unpublished).…”

Section: Effects Of Water Availability and Of Intercepted Ppfdmentioning

confidence: 80%

“…Rates of leaf expansion and of epidermal cell division are linearly related to leaf temperature in a wide range of temperatures (typically 10-30mC) in sunflower (Granier & Tardieu, 1998b), maize (Ben Haj Salah & Tardieu, 1995) and sorghum (Lafarge et al, 1998). Common relationships hold for both constant and fluctuating temperatures in the field and the growth chamber.…”

Section: How Are These Patterns Altered By Temperature ? the Use Of Tmentioning

confidence: 99%

“…Durations and rates expressed in thermal time were common to several experiments at different temperatures in different experimental conditions (Ben Haj Salah & Tardieu, 1995 ;Lafarge et al, 1998). For instance, the time for a cell to cross the elongation zone of maize was 30mCd regardless of temperature if expressed in thermal time, while it ranged from 34 to 195 h if expressed in clock time (Ben Haj Salah & Tardieu, 1995).…”

Section: How Are These Patterns Altered By Temperature ? the Use Of Tmentioning

confidence: 99%

“…11, but with a linear phase. It applies to African fields as well as to European fields and to growth chamber experiments (Lafarge et al, 1998). Both the relative elongation rate during the exponential phase and the absolute elongation rate during the linear phase are common to all leaves of a plant, except for the first five leaves preformed in the seed, and the last three leaves which usually remain small.…”

Section:          mentioning

confidence: 99%

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Modelling leaf expansion in a fluctuating environment: are changes in specific leaf area a consequence of changes in expansion rate?

1999

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Leaf expansion rate varies with leaf temperature, photon flux density (PPFD), evaporative demand and soil water status. In most simulation models, it is calculated every day by multiplying the amount of carbohydrate available to leaves by specific leaf area (SLA). However, leaf expansion rate is considerably reduced by mild water deficits which do not affect photosynthesis, and is not affected by a reduction in the PPFD intercepted during rapid leaf expansion. Specific leaf area undergoes a several-fold variability depending on PPFD, soil water status and time of day. It is increased when environmental conditions have a greater depressive effect on expansion rate than on photosynthesis, and is decreased in the opposite case. It is therefore appropriate to model leaf expansion independently of the plant carbon budget. Consistent characteristics can be deduced from a series of experiments, allowing a model of leaf expansion to be proposed. (i) Time courses of relative leaf expansion rate and of epidermal cell division rate are well conserved within a plant and across a large range of environmental conditions, provided that durations and rates are expressed in thermal time. Maximum relative rates are common to all zones of a leaf and to all leaves of a plant, in maize and sunflower. (ii) A water deficit, or a reduction in intercepted PPFD, imposed in the first half of the period of leaf development affects the relative expansion rate in the deficit only, but permanently affects the absolute expansion rate. In contrast, a reduction in PPFD causes no effect on leaf expansion if imposed in the rapid expansion period when the leaf is autotrophic. (iii) Expansion rate is related to evaporative demand and to the concentration of ABA in the xylem sap with relationships that apply under both field and laboratory conditions. (iv) Tissue expansion and epidermal cell division behave as independent processes which determine epidermal cell area at each time.

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Section: Time Course Of Leaf Expansion and Epidermal Cell Division Insupporting

confidence: 74%

Section: Effects Of Water Availability and Of Intercepted Ppfdmentioning

confidence: 80%

Section: How Are These Patterns Altered By Temperature ? the Use Of Tmentioning

confidence: 99%

Section: How Are These Patterns Altered By Temperature ? the Use Of Tmentioning

confidence: 99%

Section:          mentioning

confidence: 99%

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Modelling leaf expansion in a fluctuating environment: are changes in specific leaf area a consequence of changes in expansion rate?

1999

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Genetic Adjustment to Changing Climates: Rice

Lafarge¹,

Peng

Hasegawa

et al. 2011

Crop Adaptation to Climate Change

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Genetic dissection of temperature-dependent sorghum growth during juvenile development

et al. 2014

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Promising genome regions for improving cold tolerance of sorghum were identified on chromosomes SBI-01, SBI-03, SBI-07, and SBI-10. Chlorophyll fluorescence had no major effect on growth rates at low temperatures. Developing fast growing sorghum seedlings is an important breeding goal for temperate climates since low springtime temperatures are resulting in a prolonged juvenile development. The adaptation of sorghum to tropical and subtropical highlands gives hint for certain genetic variation. The goals of the present study were to detect marker-trait associations for leaf and dry matter growth rate and for chlorophyll fluorescence and content (SPAD) in relation to temperature. A diversity set comprising 194 genotypes was tested in eight controlled environments with temperatures ranging from 9.4 to 20.8 °C. Significant marker-trait associations (p < 0.05) were identified for each individual temperature regime and on the parameters of regression analyses describing the responses of growth or chlorophyll related traits to temperatures. The diversity set was fingerprinted with 171 diversity array technology (DArT) and 31 simple-sequence repeat (SSR) markers. SSRs were used to analyze the population structure while association studies were performed on DArT markers. Promising marker-trait associations for growth rates in relation to temperature were detected on chromosomes SBI-01, SBI-03, SBI-07, and SBI-10. Many promising loci were also significantly associated to the results obtained in individual low-temperature environments. Marker-trait associations for chlorophyll content and fluorescence did occasionally co-locate to those for growth during juvenile development but there was no evidence supporting our hypothesis that seedling growth at low temperatures is largely influenced by SPAD or fluorescence.

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Elongation rate of sorghum leaves has a common response to meristem temperature in diverse African and European environmental conditions

Cited by 33 publications

References 29 publications

Modelling leaf expansion in a fluctuating environment: are changes in specific leaf area a consequence of changes in expansion rate?

Modelling leaf expansion in a fluctuating environment: are changes in specific leaf area a consequence of changes in expansion rate?

Genetic Adjustment to Changing Climates: Rice

Genetic dissection of temperature-dependent sorghum growth during juvenile development

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