| Slow photosynthetic induction and low photosynthesis in Paphiopedilum armeniacum is related to its lack of guard cell chloroplast and peculiar stomatal anatomy. | |
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MedLine Citation:
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PMID: 21241312 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Paphiopedilum and Cypripedium are close relatives in the subfamily Cypripedioideae. Cypripedium leaves contain guard cell chloroplasts, whereas Paphiopedilum without. It is unclear whether lack of guard cell chloroplasts affects photosynthetic induction, which is important for understory plants to utilize sunflecks. To understand the role of guard cell chloroplasts on photosynthetic induction of Paphiopedilum and Cypripedium, the stomatal anatomy and photosynthetic induction of P. armeniacum and C. flavum were investigated at different ratios of red to blue light. The highest stomatal opening and photosynthesis of intact leaves in P. armeniacum were induced by irradiance enriched with blue light. Its stomatal opening could be induced by red light 250 μmol m(-2) s(-1) , but the magnitude of stomatal opening was lower than those at the other light qualities. However, the stomatal opening and photosynthesis of C. flavum were highly induced by mixed blue and red light rather than pure blue or red light. The two orchid species did not differ in stomatal density, but P. armeniacum had smaller stomatal size than C. flavum. The stomata of P. armeniacum were slightly sunken into the leaf epidermis, while C. flavum protruded above the leaf surface. The slower photosynthetic induction and lower photosynthetic rate of P. armeniacum than C. flavum were linked to the lack of guard cell chloroplasts and specific stomatal structure, which reflected an adaptation of Paphiopedilum to periodic water deficiency in limestone habitats. These results provided evidences for the morphological and physiological evolution of stomata relation for water conservation under natural selection. |
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Authors:
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Shi-Bao Zhang; Zhi-Jie Guan; Wei Chang; Hong Hu; Qing Yin; Kun-Fang Cao |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-1-17 |
Journal Detail:
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Title: Physiologia plantarum Volume: - ISSN: 1399-3054 ISO Abbreviation: - Publication Date: 2011 Jan |
Date Detail:
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Created Date: 2011-1-18 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 1256322 Medline TA: Physiol Plant Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © Physiologia Plantarum 2011. |
Affiliation:
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Kunming Institute of Botany, Chinese Academy of Sciences, Yunnan 650204, China Key Laboratory of Tropical Plant Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Yunnan 650223, China. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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