Correlation studies on photosynthetic rates girth and yield in Hevea brasiliensis

Zahar Samsuddin, . and Tan H., . and Yoon P. K., . Correlation studies on photosynthetic rates girth and yield in Hevea brasiliensis. pp. 464-54. ISSN 0127-7065

Correlation studies were carried out using photosynthetic rates (PR) of two-whorl buddings raised from budded stumps in a controlled growth chamber and yield and growth parameters of mature buddings from field trials. Positive correlations between PR and yield over five years (MY) were found. No correlations were however detected between PR and mature growth parameters i.e. girth at opening (GO) girth at fifth year of tapping (GC) and girth increment (GI). The correlations between MY and GI or GC were negative and significant. Among the growth parameters significant positive correlations were found between GO and GC GC and GI but there was no correlation between GO and GI. Multiple regression studies of PR on MY GO GC or GI suggest that MY was the only dominant and significant variable accounting for 22 of the variation in PR. Growth parameters do not appear to give significant positive predictive power for PR. When MY was used as the dependent variable with GO GC and GI as the independent variables the coefficients of multiple determination (R2) varied from 0.31 to 0.57. PR showed some additional contribution (significant at P 0.1) when considered together with growth parameters to account for MY. The significance of these results is discussed in relation to the usage of PR in early selection for yield in Hevea.

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Abstract

Correlation studies were carried out using photosynthetic rates (PR) of two-whorl buddings raised from budded stumps in a controlled growth chamber and yield and growth parameters of mature buddings from field trials. Positive correlations between PR and yield over five years (MY) were found. No correlations were however detected between PR and mature growth parameters i.e. girth at opening (GO) girth at fifth year of tapping (GC) and girth increment (GI). The correlations between MY and GI or GC were negative and significant. Among the growth parameters significant positive correlations were found between GO and GC GC and GI but there was no correlation between GO and GI. Multiple regression studies of PR on MY GO GC or GI suggest that MY was the only dominant and significant variable accounting for 22 of the variation in PR. Growth parameters do not appear to give significant positive predictive power for PR. When MY was used as the dependent variable with GO GC and GI as the independent variables the coefficients of multiple determination (R2) varied from 0.31 to 0.57. PR showed some additional contribution (significant at P 0.1) when considered together with growth parameters to account for MY. The significance of these results is discussed in relation to the usage of PR in early selection for yield in Hevea.

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Item Type:	Article
AGROVOC Term:	Hevea brasiliensis
AGROVOC Term:	Thermogravimetric analysis
AGROVOC Term:	Photosynthesis
AGROVOC Term:	Yields
AGROVOC Term:	Tapping
AGROVOC Term:	Nitrogen
AGROVOC Term:	Air
AGROVOC Term:	Clones
AGROVOC Term:	Multiple regression analysis
AGROVOC Term:	Growth rate
Geographical Term:	Malaysia
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	28 Apr 2025 05:14
URI:	http://webagris.upm.edu.my/id/eprint/23571

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