Pisum arvense

Other trisaccharides which, it has been suggested, occur in combination with flavonoids in plants are 0-/3-D-glucopyranosyl-(l— 2)-0-a-ii-rhamno-pyranosyl-(l- )-D-glucopyranose as a kaempferol derivative in potato flowers,and a galactosylsophoroside of kaempferol in Pisum arvense. -However, for both, a great deal more work is required before these structures can be fully accepted. 

Most work on carbohydrate and protein reserve deposition in dicots has been carried out using commercially important non-endospermic legumes, particularly the garden pea Pisum sativum), field pea (Pisum arvense) and broad bean, field bean or horse bean Vida faba), with fewer studies on the french bean or bushbean Phaseolus vulgaris) and soybean Glycine max). 

Changing levels of cytokinin can be followed during seed development. Cytokinin in Z. mays kernels, for example, reaches a peak 11 days after pollination and declines considerably over another 10 days [120]. A similar pattern is found in T, aestivum (Fig. 3.31). One major and two minor peaks are seen in Pisum arvense (field pea) which coincide with the maximum volume of the endosperm and with the two periods of rapid growth of the whole seed and embryo [35]. The cytokinins of immature seeds are thought, therefore, to be involved in the phases of growth and development. Whether or not they also represent a store of hormone for later germination and growth is uncertain. 

This legume is closely related to the field pea (Pisum arvense). 

The other extreme of the spectrum comprises those species which exhibit a very marked ability to reduce nitrate in their roots. Nitrate reductase levels in roots and in stems of these species are accordingly high in comparison with leaf tissue (Wallace and Pate, 1965 Atkins et al., 1979 Andrews et al., 1984). Included in this grouping are a number of legumes including field pea (Pisum arvense), white lupin, and certain woody species, especially gymnosperms and members of the Ericaceae and Proteaceae (Bollard, 1960 Martin et al., 1981 ... 

Dry peas Garden pea Pisum sativum var. sativum) Protein pea Pisum sativum var. arvense)... 

Fig. 3.7. The cardinal events in seed maturation of Pisum spp. The common time scale is the growth curve for seed fresh weight. All events depicted refer to rates within the developing cotyledons, divergent lines denoting periods of increasing rate, convergent lines times of decreasing rate. Differences between P. sativum and P. arvense are indicated. After Pate, 1975 [13]...

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