Ecophysiology of Adonis distorta, a high-mountain species endemic of the Central Apennines
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28/10/2016
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| Resumo |
Morphological, anatomical and physiological plant and leaf traits of A. distorta, an endemic species of the Central Apennines on the Majella Massif, growing at 2,675 m a.s.l, were analyzed. The length of the phenological cycle starts immediately after the snowmelt at the end of May, lasting 128 ± 10 days. The low A. distorta height (Hmax= 64 ± 4 mm) and total leaf area (TLA= 38 ± 9 cm2) associated to a high leaf mass area (LMA =11.8±0.6 mg cm−2) and a relatively high leaf tissue density (LTD = 124.6±14.3 mg cm−3) seem to be adaptive traits to the stress factors of the environment where it grows. From a physiological point of view, the high A. distorta photosynthetic rates (PN =19.6 ± 2.3 µmol m−2 s−1) and total chlorophyll content (Chla+b = 0.88 ± 0.13 mg g−1) in July are justified by the favorable temperature. PN decreases by 87% in September at the beginning of plant senescence. Photosynthesis and leaf respiration (RD) variations allow A. distorta to maintain a positive carbon balance during the growing season becoming indicative of the efficiency of plant carbon use. The results could be an important tool for conservation programmes of the A. distorta wild populations. Se han estudiado los rasgos morfologicos, anatomicos y fisiologicos de hojas de la especie endemica Adonis distorta en el macizo de Majella, Apeninos centrales. La especie crece a 2675 m de altitud y la duracion del ciclo fenologico se inicia inmediatamente despues de la fusion de la nieve a finales de mayo, con una duracion de 128±10 dias. El pequeno tamano de la planta (Hmax= 64±4 mm) y el area foliar total (TLA= 38±9 cm2) asociada a una elevada masa foliar (LMA= 11.8±0.6 mg cm−2) y una relativamente alta densidad titular de la hoja (LTD= 124.6±14.3 mg cm−3) parecen ser los rasgos de adaptacion a los factores de estres del entorno en el que crece. Desde un punto de vista fisiologico, las altas tasas fotosinteticas (PN =19.6±2.3 μmol m−2 s−1) y el contenido total de clorofila en julio (Chla+b= 0.88±0.13 mg g-1), se justifican por la temperatura mas favorable de ese mes. PN disminuye en un 87% en septiembre al inicio de la senescencia de la planta. la fotosintesis y la respiracion en la hoja (RD) presenta variaciones que permiten a A. distorta a mantener un balance positivo de carbono durante la estacion de crecimiento, siendo indicativo de la eficiencia del uso del carbono por las plantas. Los resultados podrian ser una herramienta importante para los programas de conservacion de las poblaciones silvestres de A. distorta. |
| Formato |
application/pdf |
| Identificador |
http://revistas.ucm.es/index.php/LAZA/article/view/51795 10.5209/LAZAROA.51795 |
| Publicador |
Ediciones Complutense |
| Relação |
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| Fonte |
Lazaroa; Vol 37 (2016); 125-134 Lazaroa; Vol 37 (2016); 125-134 |
| Palavras-Chave | #Adonis distorta; leaf nitrogen content; photosynthetic nitrogen use efficiency; photosynthesis #Adonis distorta; contenido en nitrogeno de la hoja; eficiencia fotosintetica; fotosintesis |
| Tipo |
info:eu-repo/semantics/article Artículo revisado por pares info:eu-repo/semantics/publishedVersion |
