INVESTIGADORES
RAVETTA Damian Andres
artículos
Título:
Seed-yield and yield components response to source sink ratio in annual andperennial species of Lesquerella (Brassicaceae).
Autor/es:
MASSNTTA W Y D. A. RAVETTA
Revista:
Industrial Crops and Products
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Año: 2011 vol. 34 p. 1386 - 1392
ISSN:
0926-6690
Resumen:
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Although the
annual Lesquerella fendleri is the
prime candidate for the development of a lesquerolic rich oil-seed crop, within
this genus there are other species available to breeders, some of which are
perennials. However, the feasibility of a perennial crop of Lesquerella is not clear because
increases in seed-yield tend to reduce perennially. The objective of this work
was to determine the effect of the source-sink
ratio on seed yield
and yield components in annual and perennial species of Lesquerella. We predicted that (i) due
to differences in allocation patterns of annual and perennial species,
seed-yield and yield components in perennials would be less affected by the source-sink
ratio (higher stability) than in annuals and (ii) since seed-weight has been
found to be the most stable yield component in other crops and their wild
relatives, most of the variation in seed-yield as a consequence of source-sink
ratios would be determined by changes in the number fruits per plant and the
number of seeds per fruit. A field experiment was carried out in Chubut,
Patagonia Argentina in a complete randomized design with four
treatments to examine source-sink
relationships in four species of Lesquerella,
two annuals (L. angustifolia, L. gracilis) and two perennials (L.
pinetorum, L. mendocina). We
used either
shading (reduction of source) or removal of flower-buds (reduction of sink) to
develop a range of source-sink relationships. All four species showed a similar
yield response to source-sink variations. Seed-yield was lower in shaded
plants, although the timing of shading influenced this response. Flower-bud
removal resulted in a significant increase in seed-yield. Seed-yield
differences among source-sink treatments were best explained by changes in the
number of fruits per plant than by the number of seeds per fruit. Source-sink
manipulations had no affect on seed weight. Flower-bud removal significantly
increased the number of fruits per plant in all species except for L.
mendocina. The number of seeds per fruits increased only in L. pinetorum. Our results show that
carbon stored during pre-anthesis plays a key role in reproduction both in
annual and perennial Lesquerella. The increase in the seed-yield
components found with bud removal could potentially reduce longevity in
perennial species. The results also show that the number of fruits per plant is
a good proxy for seed-yield within a species.
Keywords: new crops,
seed-weight, carbon storage, oil-seed crops.