Journal Article10.1007/S10265-014-0624-4
Influence of germination date on Dioon edule (Zamiaceae) seedling tolerance to water stress
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TL;DR: The March–April GD seedlings with undeveloped sclerified hypodermis and stomata, presented reduced leaf area, lower Chlorophyll a/b ratio, higher CAM activity and midday partial stomatal closure when reached Ψs of −1.0 MPa, which have higher probability of dehydration during severe drought (February–April) than those of the December–February GD with similar Ωs.
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Abstract: Dioon edule seedling mortality is mostly attributed to dehydration by prolonged drought, even when they present xeromorphic characteristics like the adult plants. The effect of germination date (GD) and soil water deficit on seedling tolerance to water stress was assessed. The seedlings germinated and grown from mature seeds every month from December to April GD were selected to evaluate the leaf area, photosynthetic pigment content, crassulacean acid metabolism (CAM) activity, stomatal conductance (gs) and leaflet anatomy at soil water potential (Ψs) of 0.0 MPa (day 1), −0.1 MPa (day 40), −1.0 MPa (day 90), −1.5 MPa (day 130), and a control (0.0 MPa at day 130) to recognize differences due to leaf development. The seedlings shifted from C3 to CAM cycling when exposed to water stress at Ψs of −1.0 MPa, like adult plants. The March–April GD seedlings with undeveloped sclerified hypodermis and stomata, presented reduced leaf area, lower Chlorophyll a/b ratio, higher CAM activity and midday partial stomatal closure when reached Ψs of −1.0 MPa. These have higher probability of dehydration during severe drought (February–April) than those of the December–February GD with similar Ψs. Plants used for restoration purposes must have full leaf development to increase the survival.
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Citations
The phylogeography of the cycad genus Dioon (Zamiaceae) clarifies its Cenozoic expansion and diversification in the Mexican transition zone.
José Said Gutiérrez-Ortega,María Magdalena Salinas-Rodríguez,José F. Martínez,Francisco Molina-Freaner,Miguel Ángel Pérez-Farrera,Andrew P. Vovides,Yu Matsuki,Yoshihisa Suyama,Takeshi A. Ohsawa,Yasuyuki Watano,Tadashi Kajita +10 more
TL;DR: The current genetic structure and species diversity of Dioon depict the history of expansion and diversification of the northernmost Neotropical provinces.
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A trait-based approach to the conservation of threatened plant species
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Ecological and Social Limitations for Mexican Dry Forest Restoration: A Systematic Review
TL;DR: In this article , the authors explored the ecological and social limitations on the restoration of Mexican dry forests from the perspective of restoration practitioners and researchers and found that three times more publications addressing ecological limitations than those addressing social limitations.
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Systematic implications of pinna venation and pinna anatomy in Zamiaceae
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Ontogenetic Changes in Azoxyglycoside Levels in the Leaves of Dioon edule Lindl
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