Quantitative effects of the genes Lf, Sn, E, and Hr on time to flowering in pea (Pisum sativum L.) |
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Authors: | Alcade J; Wheeler T; Summerfield R; Norero A |
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Institution: | Departamento de Ciencias de Recursos Naturales, Facultad de Agronomia e Ingenieria Forestal, Pontificia Universidad Catolica de Chile. Casilla 306, Santiago 22, Chile; Department of Agriculture, The University of Reading, Earley Gate, PO Box 236, Reading RG6 6AT, UK; Corresponding author; Fax: +56 2 5526005; E-mail: jalcalde@puc.cl |
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Abstract: | Flowering time in pea (Pisum sativum L.) is determined
by genetically controlled responses to photoperiod and temperature. To
investigate these responses, 11 lines homozygous for the flowering genes
Lf, Sn, E, and Hr were grown
under contrasting semi-controlled photothermal environments and the
durations (d) from sowing to first flower (f) were
recorded. The effects of the four genes were quantified using a two-plane
photothermal model which linearly relates the rate of progress from sowing
to flowering (1/f) with the mean pre-flowering values
of temperature (T) and/or photo-period (P), based on
1/fa + bT
(when P is longer than the critical photoperiod, Pc) and
1/fa +
bT + cP
(when P<Pc). The main effect of Lf alleles was
on temperature sensitivity (b) when P>Pc, which
increased in the sequence
Lfd<Lf<
lf<lfa. Gene
Hr, when together with Sn,
increased photoperiod sensitivity (c) and
reduced the intercept (a) when P<Pc.
Allele sn determined a single plane response to
temperature alone (i.e. a day-neutral response). Gene
E, when present with lf Sn,
increased 1/f in both the thermal (P<Pc) and
photothermal (PPc) domains, mainly by
increasing a and b,
respectively. Variations in the coefficients of the thermal and
photothermal responses determined that the critical photoperiod varied with
temperature in all photoperiod-sensitive genotypes. A common base
temperature of 0.2C was determined amongst
Day-Neutral Class genotypes (sn) and thermal time from
sowing to flowering increased in the sequence
lfa<lf<
<:f<Lfd. Intra-Class
variations attributed to the Lf alleles were also
detected in the Late (Sn hr) and Late High Response
(Sn Hr) Classes. The linear photothermal model
provided a sound basis for studying the quantitative effects of flowering
genes in pea. |
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Keywords: | |
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