. Agricultural botany, theoretical and practical. Botany, Economic; Botany. 484 GRAMINE^. CEREALS embryo does not make its exit where the coleorhiza and roots emerge but grows on beneath the glume, and ultimately appears at the opposite end of the grain sometime after the roots have come forth (Fig. 151). The number of roots vis- ible on the embryo within the barley grain is generally five or six. (c) In the oat the caryopsis is free from the glumes, but the latter more or less tightly surround it and on germina- tion the plumule of the em- bryo behaves as in barley, and emerges from the grain
. Agricultural botany, theoretical and practical. Botany, Economic; Botany. 484 GRAMINE^. CEREALS embryo does not make its exit where the coleorhiza and roots emerge but grows on beneath the glume, and ultimately appears at the opposite end of the grain sometime after the roots have come forth (Fig. 151). The number of roots vis- ible on the embryo within the barley grain is generally five or six. (c) In the oat the caryopsis is free from the glumes, but the latter more or less tightly surround it and on germina- tion the plumule of the em- bryo behaves as in barley, and emerges from the grain at the end opposite to that at which the roots appear; the number of roots of the embryo is three. âIn the cereals, as in all grasses, the roots of the embryo within the seed â,'.,''. , ,. grow out when germination Fig. 151.âBarley gram showing embryo and Its " o development during germination. commcnces : these may be 1. Longitudinal section of grain showing â ' embryo at rest. . , , , iexmed'semifta/'roofs. They 2. The same alter germination has begun ; the roots have made tlieir exit from the grain, but the are of importance m the early plumule c is still within it enclosed by the ^ flowering glume. life of the young plant, but 3. Later stage of the germinated gram showing , ,. -- n 1 â the plumule c outside the grain. Subsequently die off and their e Endosperm; a coleorhiza; i root; c plumule; . (^scuteiium. work IS Undertaken by the so-called 'coronal' roots which arise from the lower nodes of the stems as explained below (see Figs. 152 to 154). 'Tillering.'âA, Fig. 152 gives the appearance of a young barley plant after a single green leaf has appeared above ground. At this stage it possesses a small bunch of roots which have come. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Perci
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1910
