NDLI: Growth and photosynthetic responses of Gallesia integrifolia (Spreng.) Harms and Schinus terebinthifolius Raddi seedlings in dense shade

Content Provider	Springer Nature Link
Author	Feijó, Natalia S. A. Mielke, Marcelo S. Gomes, Fabio P. França, Solange Lavinsky, Alyne O.
Copyright Year	2008
Abstract	We analyzed the growth and photosynthetic behavior of Gallesia integrifolia (‘pau-d’alho’) and Schinus terebinthifolius (‘aroeirinha’) under shade, seeking to obtain ecophysiological information for introducing seedlings of those species in previously established cacao agroforestry systems. Considering that light intensity under the shade of cacao trees varied between 5 and 10% daylight, 5 months old seedlings were exposed to four irradiance levels (25, 17, 10 and 5% daylight) for 92 days. With shade increase both species displayed trends of decrease leaf mass per unit leaf area, leaf area per plant (LA), relative growth rate (RGR) and net assimilation rate (NAR), and increase leaf area ratio (LAR). The mean values of light-saturated net photosynthetic rate (P nmax) in 25 and 5% daylight were 12.8 and 8.0 μmol CO2 m−2 s−1 for G. integrifolia and 17.9 and 7.4 μmol CO2 m−2 s−1, respectively, for S. terebinthifolius. Based on the measurements of photosynthetic photon flux density and estimated values of photosynthetic saturated irradiance (Is) we concluded that, in all shaded conditions, the leaves of both species were under sub optimal light conditions to reach P nmax. In spite of the lowest P nmax values, RGR and NAR were significantly higher for G. integrifolia in all irradiance levels. Differences in growth rates can be explained by the higher values of LA, LAR and leaf mass ratio (LMR), as well as by the lower values of Is, photosynthetic compensation irradiance and dark respiration rates observed for G. integrifolia. Even though seedlings of G. integrifolia presented higher capacity to adapt under conditions of dense shade, we concluded that both species were under stress conditions induced by shade in light environments below 25% daylight. On a practical point of view it is possible to conclude that seedlings of both species should be introduced in light gaps, formed after the fall of big trees, or in places in which cacao trees are cultivated using large plant spacing.
Starting Page	49
Ending Page	58
Page Count	10
File Format	PDF
ISSN	01674366
Journal	Agroforestry Systems
Volume Number	77
Issue Number	1
e-ISSN	15729680
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-11-13
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Net photosynthetic rate Nontimber forest products Shade tolerance Agriculture Forestry
Content Type	Text
Resource Type	Article
Subject	Forestry Agronomy and Crop Science

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