NDLI: Does shading explain variation in morphophysiological traits of tropical epiphytic orchids grown in artificial conditions?

Content Provider	Springer Nature Link
Author	Pires, Marcel Viana Almeida, Alex Alan Furtado Abreu, Priscilla Patrocínio Costa Silva, Delmira
Copyright Year	2012
Abstract	Light is one of the main factors of physical environment and it controls plant growth and development by interfering with photosynthesis, especially concerning CO$_{2}$ assimilation. Photosynthetic characteristics and growth of C3 epiphytic orchids Miltonia flavescens and Miltonia spectabilis var. moreliana were analyzed under four radiation regimens (25, 50 and 75 % of global radiation and full sunlight). Anatomical characterizations were performed on plants grown at 25 % shade. Artificial shading was obtained using different shading nylon nets. The highest values of light-saturated photosynthetic, dark respiration, net photosynthetic and leaf transpiration rates, stomatal conductance and intercellular to atmospheric CO$_{2}$ concentration ratio were observed at full sunlight and 25 % shade. Moreover, both species allocated greater amount of leaf dry weight in those treatments. On the other hand, it was observed a greater investment in pseudobulb biomass in more shaded conditions (50 and 75 %), corroborating with the highest values of intrinsic water-use efficiency observed in those treatments. It was found a significant effect of shading on leaf area and specific leaf area. The anatomical features reflected strategies to save water. The phenotypic plasticity and principal component analysis suggested that the physiological traits were more responsive to light levels than the morphological traits. The results indicate that those species appear to be adapted to high irradiances conditions and are capable of adjusting, via morphophysiological changes, to light availability.
Starting Page	2155
Ending Page	2164
Page Count	10
File Format	PDF
ISSN	01375881
Journal	Acta Physiologiae Plantarum
Volume Number	34
Issue Number	6
e-ISSN	18611664
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-05-24
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Anatomy Biomass allocation Epiphytic orchids Irradiance Leaf gas exchanges Plant Physiology Plant Genetics & Genomics Plant Biochemistry Plant Pathology Plant Anatomy/Development Agriculture
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science Agronomy and Crop Science

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