Cotyledons development

Figure 1. Effect of twinberry leaf extract infiltrated 24 hours after virus inoculation on TMV starch lesion development on cucumber cotyledons...

Millichip, M. et al.. Purification and characterization of oil-bodies (oleosomes) and oil-body boundary proteins (oleosins) from the developing cotyledons of sunflower (Helianthus annuus L.), Biochem. J., 314, 333, 1996. 

Cotyl cotyledons and developing up stem and leaves. Hyp Hypocotyl... 

No appreciable development of betacyanin pigment in the dark was observed in any of the weed seedlings during the course of the experiment. The development of betacyanin in the cotyledons of dark-grown A. retroflexus seedlings is reported to be induced by the plant growth regulator, kinetin (20), but not by brassinolide, a steroidal lactone (21). 

The seeds of dicotyledonous plants have two cotyledons, or seed leaves, which are part of the embryo. The cotyledons usually are the main storage tissue, although in some plants (such as castor bean) the endosperm also has a storage function. During development in the field, seeds gradually accumulate storage oils, proteins and carbohydrates (Table 3.1). In the seed, the cotyledon structure is relatively simple. The remainder of the embryo, the embryonic axis, consists mostly of undifferentiated cells, but provascular tissue can be detected that develops into vascular tissue in the seedling. 

Harris N. Nuclear pore distribution and relation to adjacent cytoplasmic organelles in cotyledon cells of developing Vida faba. Planta 1978 141 121-128. 

Barker, D.H., Seaton, G.G.R., and Robinson, S.A., Internal and external photoprotection in developing leaves of the CAM plant Cotyledon orbiculata. Plant Cell Environ., 20, 617, 1997. 

Cotyledon The first leaf, or one of the first whorl of leaves, developed by the embryo sporophyte in seed plants, and the first leaf produced on the sporophyte of pteridophytic plants. 

Figure 32-8 (A) The life cycle of a flowering plant with emphasis on egg-cell formation and seed development. (B) Some further details of embryo development. T, terminal cell B, basal cell C, cotyledon A, axis SC, seed coat En, endosperm EP, embryo proper S, suspensor SM, shoot meristem Pd, protoderm RM, root meristem. From Goldberg et al.i66 with modification.

In M. guttatus, pea and maize, these genes appear to be expressed in a root-specific pattern. Levels of transcript are barely detectable in leaves, developing cotyledon, pith, seed and anther (de Miranda et al., 1990 Evans et al., 1990 de Framond, 1991). However, the soybean gene is expressed constitutively in both roots and leaves (Kawashima et al., 1991). 

To date very little is known of the regulation of the gln-a gene. This gene must be expressed strongly during seed development as its mRNA is present at quite high levels in both the cotyledons and embryonic axis of dry seeds and is the predominant or perhaps only GS mRNA present in... 

Bray, E.A. Beachy, R.N. (1985). Regulation by ABA of P-congly-cinin expression in cultured developing soybean cotyledons. Plant Physiology 79, 746-50. 

Cullis, C. A. Chromatin-bound DNA-dependent RNA polymerase in developing pea cotyledons. Planta, 1976, 131, 293-298. 

To properly evaluate data relating to reserve starch development and composition, cellular development of tissues in which this starch is formed must be appreciated. Enlarging potato tubers,38 cotyledons of developing pea seeds39 and endosperms... 

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