The physiology of ex vitro pineapple (<Emphasis Type="Italic">Ananas comosus</Emphasis> L. Merr. var MD-2) as CAM or C3 is regulated by the environmental conditions |
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Authors: | C?Aragón L?Carvalho J?González M?Escalona Email author" target="_blank">S?AmancioEmail author |
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Institution: | 1.Laboratorio de Células y Cultivo Tejidos, Centro de Bioplantas,Universidad de Ciego de ávila,Ciego de ávila,Cuba;2.CBAA/DRAT, Instituto Superior de Agronomia,Universidade Técnica de Lisboa,Lisboa,Portugal |
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Abstract: | Many plant species grown under in vitro controlled conditions can be used as models for the study of physiological processes.
Adult pineapple can display CAM physiology while in vitro it functions as a C3 plant. Ex vitro Ananas comosus has plastic morphology and physiology, both easy to modify from C3 to CAM by changing the environmental conditions. The yield
of survival for a rentable propagation protocol of pineapple is closely related with the C3/CAM shift and the associated physiological
characteristics. In the present work, ex vitro pineapple plants were divided in two sets and subjected to C3 and CAM-inducing
environmental conditions, determined by light intensity and relative humidity, respectively, 40 μmol m−2 s−1/85% and 260 μmol m−2 s−1/50%. The results demonstrated that the stress imposed by the environmental conditions switched pineapple plants from C3 to
CAM behavior. Comparing to CAM induced, C3-induced pineapple plants showed substandard growth parameters and morphological
leaf characteristics but a better rooting process and a higher ABA production, a phenotype closer to adult plants, which are
expected to produce fruits in a normal production cycle. We conclude that the upholding of these characteristics is conditioned
by low light intensity plus high relative humidity, especially during the first 8 weeks of ex vitro growth. It is expected
that the better understanding of pineapple acclimatization will contribute to the design of a protocol to apply as a rentable
tool in the pineapple agronomic industry. |
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