Axillary Bud Development in White Clover in Relation to Defoliation and Shading Treatments

Central dieback of the dryland bunchgrass Eragrostis curvula (weeping lovegrass) re-examined: The experimental clearance of tussock centres

“…Flattening of the curves during the later stages of canopy development (90 plus days after treatment) was partially due to tiller senescence (data not shown). It may also indicate that bud viability was reduced by shading from the neighbouring tillers ( Jewiss, 1972;Deregibus et al, 1983;Davies & Evans, 1990), or production of new tillers from basal meristems was suppressed as tiller density increased (Hutchings, 1979;Jonsdottir, 1991). Repeated measures analysis with all time segments combined (20 weeks) showed less significant treatment effects (p"0)1), reflecting diminished effects of the initial treatments as the canopy closed, which is consistent with the regression analyses (curve flattening).…”

Patterns of nodal rooting in Trifolium repens (L.) and correlations with stages in the development of axillary buds

“…Root presence within a stolon reached a maximum at node 4, which is similar to the finding of Chapman (1983) that most root initiation occurs 4-8 weeks from the appearance of a node. These data emphasize the importance of young nodes (^ 10) for root development as well as for branch development (Davies and Evans, 1990;Newton el al., 1992). However, it should be remembered that only root presence was recorded in this study, not the dimensions or activity of roots.…”

Tiller recruitment and mortality in the dryland bunchgrass Eragrostis curvula as affected by defoliation intensity

“…It is likely that the decline in tiller numbers per marked shoot during the later stages of canopy development was partially due to the competition in the resources between tillers. As the canopy closed, outgrowth of buds from a tiller was reduced by self-shading or shading from the neighboring tillers (Jewiss, 1972;Deregibus et al, 1983;Davies & Evans, 1990;de Kroon & Kwant, 1991;Jonsdottir, 1991;Makita, 1996). As a canopy closes, some old tillers senesce and new tiller production probably becomes a liability rather than a benefit, because the new tillers are being shaded and are less likely to make a positive contribution to the carbon budget of the plant (Skinner & Nelson, 1992).…”

“…Jones & Davies (1988) found in white clover, a reduction of leaf complement from two leaves to one leaf led to a reduction in subsidiary branch production of about 25%. Davies & Evans (1990) reported that the development of branches from axillary buds in white clover was slower at nodes in which the leaves were removed and the stolons shaded. Branches initiated more quickly in treatments in which petioles, or petioles plus laminae, were retained.…”