Nutritional restriction triggers callose accumulation on the sieve plates of the funiculus of developing bean seeds
Por:
Martinez-Barradas, V, Bernal, L., Lopez-Baltazar, J., Coello, P., Cruz-Garcia, F., Marquez, J., Martinez-Barajas, E.
Publicada:
1 mar 2019
Categoría:
Plant science
Resumen:
Seed development represents a very high investment of metabolic
resources that plants are not always able to fulfill, and nutrient
remobilization is widely used to support seed development under
stressful conditions. Phaseolus vulgaris fruits removed from the plant
at 20 days after anthesis (DAA) respond to nutrient restriction by
recycling pod material. At the same time, the available resources are
channeled to a fewseeds in order to produce some viable seeds. By
analyzing carbohydrate levels and the distribution of sucrose [U-C-14]
between the pod tissue and seed sections (funiculus, seed coat and
embryo), in combination with the structural analysis of phloem sieve
plates; we were able to identify that nutrient flow is reduced at the
funiculus level. The accumulation of callose resulted in a large
reduction in the diameter of the sieve pores that eventually will stop
nutrient flow. It produces the death of most seeds, but also increases
the probability of some seeds to successfully completing their
development during severe nutrient restriction. (C) 2019 SAAB. Published
by Elsevier B.V. All rights reserved.
Filiaciones:
Martinez-Barradas, V:
Facultad de Química, UNAM, Universidad Nacional Autónoma de México, Ciudad de México, 04510, Mexico
UNAM, Fac Quim, Ciudad De Mexico 04510, DF, Mexico
Bernal, L.:
Facultad de Química, UNAM, Universidad Nacional Autónoma de México, Ciudad de México, 04510, Mexico
UNAM, Fac Quim, Ciudad De Mexico 04510, DF, Mexico
Lopez-Baltazar, J.:
Facultad de Química, UNAM, Universidad Nacional Autónoma de México, Ciudad de México, 04510, Mexico
Instituto Tecnológico del Valle de Oaxaca, Oaxaca, 71230, Mexico
UNAM, Fac Quim, Ciudad De Mexico 04510, DF, Mexico
Inst Tecnol Valle Oaxaca, Oaxaca 71230, Mexico
Coello, P.:
Facultad de Química, UNAM, Universidad Nacional Autónoma de México, Ciudad de México, 04510, Mexico
UNAM, Fac Quim, Ciudad De Mexico 04510, DF, Mexico
Cruz-Garcia, F.:
Facultad de Química, UNAM, Universidad Nacional Autónoma de México, Ciudad de México, 04510, Mexico
UNAM, Fac Quim, Ciudad De Mexico 04510, DF, Mexico
Marquez, J.:
Facultad de Ciencias, Universidad Nacional Autonoma de Mexico, Ciudad de Mexico, 04510, Mexico
Univ Nacl Autonoma Mexico, Fac Ciencias, Ciudad De Mexico 04510, DF, Mexico
Martinez-Barajas, E.:
Facultad de Química, UNAM, Universidad Nacional Autónoma de México, Ciudad de México, 04510, Mexico
UNAM, Fac Quim, Ciudad De Mexico 04510, DF, Mexico
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