Plant Anatomy From the Standpoint of the Development And Functions of the ...
Plant Anatomy From the Standpoint of the Development And Functions of the ...
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As to the length of life of the phloem elements, in some plants the sieve tubes live but a single year while in others they may survive and remain functional for a few years at most. The companion and phloem parenchyma cells may die with the sieve tubes, but in some cases they survive these, even until they become cut off from the general circulation during the formation of borke (see page 57). Therefore in stems several years old we are apt to find the outer and older por- tions of the phloem ...collapsed and dead (Fig. 24).
Relation of One Year's Phloem Elements to those of the Next. — Fig. 95 shows diagrammatically how the phloem of one year narrows down at the close of the year's growth in length and lies in immediate contact with the primary (earliest-formed) phloem of the following year. The ending of the year's phloem (where it tapers to a point in the dia- gram) consists of sieve tubes and companion cells in Dicoty- ledons, and sieve tubes and vertical rows of phloem paren- chyma cells in Gymnosperms; and these join with the corre- sponding elements that are first differentiated from the pro- cambium of the succeeding year's growth in length.
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You can find similar books in the "Read Also" column, or choose other free books by Stevens, William Chase, 1861- to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
As to the length of life of the phloem elements, in some plants the sieve tubes live but a single year while in others they may survive and remain functional for a few years at most. The companion and phloem parenchyma cells may die with the sieve tubes, but in some cases they survive these, even until they become cut off from the general circulation during the formation of borke (see page 57). Therefore in stems several years old we are apt to find the outer and older por- tions of the phloem ...collapsed and dead (Fig. 24).
Relation of One Year's Phloem Elements to those of the Next. — Fig. 95 shows diagrammatically how the phloem of one year narrows down at the close of the year's growth in length and lies in immediate contact with the primary (earliest-formed) phloem of the following year. The ending of the year's phloem (where it tapers to a point in the dia- gram) consists of sieve tubes and companion cells in Dicoty- ledons, and sieve tubes and vertical rows of phloem paren- chyma cells in Gymnosperms; and these join with the corre- sponding elements that are first differentiated from the pro- cambium of the succeeding year's growth in length.
What to read after Plant Anatomy From the Standpoint of the Development And Functions of the ...?
You can find similar books in the "Read Also" column, or choose other free books by Stevens, William Chase, 1861- to read onlineMoreLess
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