Growth and ecophysiological response in juvenile clones of Guadua (Guaduinae: Bambusoideae) cultivated in an altered lowland tropical region

Title:

Growth and ecophysiological response in juvenile clones of Guadua (Guaduinae: Bambusoideae) cultivated in an altered lowland tropical region

Creator:

Ely, F., Araque, O., and Jaimez, R.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:666d4f6d-274b-4aca-8cdb-ea7b419390f2
uuid:666d4f6d-274b-4aca-8cdb-ea7b419390f2
issn:0300-3604
doi:10.1007/s11099-016-0236-4

Subject:

bambus, fotosyntéza, Bamboo, photosynthesis, Venezuela, chlorofyl a fluorescence, vodní potenciál listu, chlorophyll a fluorescence, leaf water potentials, 2, and 581

Type:

model:article and TEXT

Format:

print, bez média, and svazek

Description:

Guadua amplexifolia and Guadua angustifolia are the most promising timber substitutes amongst American bamboos due to their outstanding dimensions and structural properties. Despite the commercial potential of these species, there are few studies on the survival and adaptability of juveniles in plantations. The present study dealt with survival, growth, and ecophysiological response of juvenile clonal plants of these species, cultivated in abandoned pastures in Mérida, Venezuela. Survivorship, growth (height and culm diameter), and ecophysiological parameters were monitored the first year during wet and dry seasons. Survival rates were high in both species (95% in G. amplexifolia and 89% in G. angustifolia). Midday leaf water potentials decreased in both species during dry months (-1.28 to-2.72 MPa in G. amplexifolia and-1.67 to-2.37 MPa in G. angustifolia, respectively). Net photosynthetic rates measured during wet [16.57 ± 1.40 and 13.68 ± 2.40 μmol(CO2) m-2 s-1, respectively] and dry seasons [12.19 ± 2.82 and 8.12 ± 1.81 μmol(CO2) m-2 s-1, respectively], demonstrated that G. amplexifolia maintained consistently higher photosynthetic rates compared to G. angustifolia, which could explain the higher growth rates of the former. Similar trends were observed for stomatal conductance, transpiration, water-use efficiency, electron transport rate, and photochemical quenching of PSII. G. angustifolia maintained higher nonphotochemical quenching as well as a higher consumption of electrons per molecule of CO2 fixed, indicating a lower photosynthetic efficiency. The maximal photochemical efficiency of PSII (0.73-0.76) suggested that neither of these species suffered from photoinhibition, despite persistently high radiation and air temperatures at the study site., F. Ely, O. Araque, R. Jaimez., and Obsahuje bibliografii

Language:

Multiple languages

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

264-275

Source:

Photosynthetica | 2017 Volume:55 | Number:2

Harvested from:

CDK

Metadata only:

false