Rapid wall relaxation in elongating tissues. [Glycine max (L. ); Pisum sativum L]
- Texas A and M Univ., College Station (United States)
Reported differences in the relaxation of cell walls in enlarging stem tissues of soybean (Glycine max (L.) Merr.) and pea (Pisum sativum L.) cause measurements of the yield threshold turgor, an important growth parameter, to be in doubt. Using the pressure probe and guillotine psychrometer, the authors investigated wall relaxation in these species by excising the elongating tissue in air to remove the water supply. The authors found that the rapid kinetics usually exhibited by soybean could be delayed and made similar to the slow kinetics previously reported for pea if slowly growing or mature tissue was left attached to the rapidly growing tissue when relaxation was initiated. The greater the amount of attached tissue, the slower the relaxation, suggesting that slowly growing tissue acted as a water source. Consistent with this concept was a lower water potential in the rapidly elongating tissue than in the slowly growing tissue. If this tissue was removed from pea, relaxation became as rapid as usually exhibited by soybean. It is concluded that the true relaxation of cell walls to the yield threshold requires only a few minutes and that the yield threshold in the intact plant before excision. Under these conditions, the yield threshold was close to the turgor in the intact plant regardless of the species.
- DOE Contract Number:
- FG05-84ER13273
- OSTI ID:
- 5742251
- Journal Information:
- Plant Physiology; (United States), Vol. 86; ISSN 0032-0889
- Country of Publication:
- United States
- Language:
- English
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