Phenology and reproductive effort of cultivated and wild forms of <i>Pennisetum glaucum</i> under experimental conditions in the Sahel: implications for the maintenance of polymorphism in the species

Renno, Jean-François; Winkel, Thierry

doi:10.1139/b96-119

Cited by 14 publications

(9 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Under such conditions of unpredictable rain and traditional, low‐input farming, extended tillering associated with leaf area maintenance and large interindividual variability in the flowering period are valuable traits for a cereal ideotype (Janssens et al. , 1990; Renno & Winkel, 1996; De Rouw & Winkel, 1998).…”

Section: Discussionmentioning

confidence: 99%

“…Both situations offer opportunity for main stems on late plants or tillers on early plants to grow and produce panicles which otherwise would remain undeveloped. Under such conditions of unpredictable rain and traditional, low-input farming, extended tillering associated with leaf area maintenance and large interindividual variability in the flowering period are valuable traits for a cereal ideotype (Janssens et al, 1990;Renno & Winkel, 1996;De Rouw & Winkel, 1998).…”

Section: Consequences Of Drought On Plant Growth and Grain Yieldmentioning

confidence: 99%

See 1 more Smart Citation

Ontogeny modifies the effects of water stress on stomatal control, leaf area duration and biomass partitioning of Pennisetum glaucum

Winkel¹,

Payne²,

Renno³

2001

New Phytologist

Self Cite

View full text Add to dashboard Cite

Summary• 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.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Consequences Of Drought On Plant Growth and Grain Yieldmentioning

confidence: 99%

Ontogeny modifies the effects of water stress on stomatal control, leaf area duration and biomass partitioning of Pennisetum glaucum

Winkel¹,

Payne²,

Renno³

2001

New Phytologist

Self Cite

View full text Add to dashboard Cite

show abstract

“…This difference in the length of flowering makes the overlap more likely, because at least some wild plants will flower in synchrony with most of the cultivated ones. Conversely, overlaps can be limited, so that many wild plants will be isolated from the cultivated pollen source (Renno and Winkel, 1996). Growing early or late cultivars may thus have significant effects on the extent of crop gene dispersal.…”

Section: (Trans)gene Dispersalmentioning

confidence: 99%

Crop-to-wild gene flow, introgression and possible fitness effects of transgenes

Jenczewski

Ronfort

Chèvre

2003

Environ. Biosafety Res.

100

View full text Add to dashboard Cite

Crop-to-wild gene flow has received close attention over the past ten years in connection with the development and cultivation of transgenic crops. In this paper, we review key examples of crop/wild sympatry and overlapping flowering phenology, pollen and seed dispersal, the barriers to hybridisation and introgression, the evolution and fate of interspecific hybrids, their fitness, and the potential cost of transgenes. We pay particular attention to ways in which the evolution and divergence between crops and their wild relatives may interfere with these successive steps. Our review suggests that crop-to-weed gene flow is highly idiosyncratic and that crop gene dispersion will certainly be very difficult to preclude totally. Future directions for research should thus focus on the long-term establishment and effects of transgenes on natural communities.

show abstract

“…For example, Brouwer et al (1993) showed how soil and crop micro-variability can have an impact on yield, as some parts of the eld could be more adapted to dryness and could thus compensate poor or less good performances of other parts of the eld. Renno and Winkel (1996) also showed how interindividual variability of owering could prevent from short-term stresses risks.…”

Section: Introductionmentioning

confidence: 96%

Modelling the interindividual variability of organogenesis in sugar beet populations using a hierarchical segmented model

Baey¹,

Didier²,

Lemaire³

et al. 2013

Ecological Modelling

View full text Add to dashboard Cite

Cournède. Modelling the interindividual variability of organogenesis in sugar beet populations using a hierarchical segmented model. Ecological Modelling, Elsevier, 2013, 263, pp.56-63. 10.1016/j.ecolmodel.2013 Modelling the interindividual variability of organogenesis in sugar beet populations using a hierarchical segmented model AbstractModelling the interindividual variability in plant populations is a key issue to enhance the predictive capacity of plant growth models at the eld scale. In the case of sugar beet, this variability is well illustrated by rate of leaf appearance, or by its inverse the phyllochron. Indeed, if the mean phyllochron remains stable among seasons, there is a strong variability between individuals, which is not taken into account when using models based only on mean population values.In this paper, we proposed a nonlinear mixed model to assess the variability of the dynamics of leaf appearance in sugar beet crops. the four parameters were signicant. Also, the rupture thermal time was found to be non signicantly correlated to the other three parameters. We compared our piecewise-linear formulation with other formulations such as sigmoïd orGompertz models, but they provided higher AIC and BIC.A method to assess the eects of environmental factors on model parameters was also studied and applied to the comparison of three levels of Nitrogen (control, standard and high dose). Taking into account the IIV, our model showed that plants receiving Nitrogen tended to have a later time of initiation, a higher rate of leaf appearance, and an earlier rupture time, but these dierences were not dose-dependent (no dierences between standard and high dose of Nitrogen). No dierences were found on the leaf appearance rate of the second phase between the three treatments.

show abstract

Phenology and reproductive effort of cultivated and wild forms of Pennisetum glaucum under experimental conditions in the Sahel: implications for the maintenance of polymorphism in the species

Cited by 14 publications

References 16 publications

Ontogeny modifies the effects of water stress on stomatal control, leaf area duration and biomass partitioning of Pennisetum glaucum

Ontogeny modifies the effects of water stress on stomatal control, leaf area duration and biomass partitioning of Pennisetum glaucum

Crop-to-wild gene flow, introgression and possible fitness effects of transgenes

Modelling the interindividual variability of organogenesis in sugar beet populations using a hierarchical segmented model

Contact Info

Product

Resources

About