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A comparative analysis of the root systems of light grown and dark grown seedlings of pea pisum sativum cultivar alaska



A comparative analysis of the root systems of light grown and dark grown seedlings of pea pisum sativum cultivar alaska



Plant Science 75(1): 117-122



Pea seedlings (Pisum sativum cv. Alaska) were grown in vermiculite in the light of dark for up to 4 weeks. Primary roots of these seedlings were approximately the same in length and weight for both treatments. More lateral roots were formed in light-grown seedlings and their total weight was greater than in dark-grown seedlings. In both light and dark the percent of unemerged lateral roots decreased from 100% as lateral roots emerged and finally remained constant at about 20% of the total as the primary root continued to elongate. The heightr of the meristem decreased as the primary root elongated, from almost 2 mm in 40-mm long primary roots to less than 0.5 mm in primary roots longer than 200 mm, in both dark- and light-grown seedlings. Nodules from only on roots of light-grown seedlings and never on roots of dark-grown seedlings. These studies demonstrate a dual control system where the cotyledons regulate the growth of the primary root, and the shoot controls the lateral root system after about 2 weeks of light.

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Accession: 006935452

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