Movement of Calcium Across Tips of Primary and Lateral Roots of Phaseolus vulgaris

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Abstract
Ca movement across tips of primary and lateral roots of P. vulgaris was determined by applying 45Ca2+ to one side of the root and collecting radioactivity in an agar receiver block on the opposite side of the root. The ratios of cpm in receiver blocks on the bottom of primary roots:cpm in receiver blocks on the top of primary roots were 1.87 and 2.47 after 1 and 2 h, respectively. This polar transport of Ca across tips of primary roots correlated positively with a gravicurvature of 43.degree. after 2 h. The ratio of cpm in receiver blocks on the bottom of lateral roots:cpm in receiver blocks on the top of lateral roots was 1.20 after 2 h. The decreased polar movement of Ca across tips of lateral roots correlated positively with lateral roots being nongraviresponsive. Gravistimulation apparently induces polar movement of Ca toward the lower side of tips of primary roots. The reduced polar movement of Ca across tips of lateral roots may be involved in uncoupling gravistimulation from gravicurvature in lateral roots.

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