IS LEAF SIZE A FACTOR IN DETERMINATION OF THE RATE OF TRANSPIRATION IN CANNA INDICA AND EUPHORBIA MILII?
1A. A. ABDULRAHAMAN, 2B. U.OLAYINKA, 3A. A. AL SAHLI, 3 I. A. ALARAIDH AND F. A. OLADELE
1 AND F. A. OLADELE 1Applied Plant Anatomy And Wood Technology Laboratory, Department Of Plant Biology, Faculty Of 2 Life Sciences,University Of Ilorin, Ilorin, Nigeria, Department Of Plant Biology, Faculty Of Life Sciences,University Of Ilorin, Ilorin, Nigeria, Department Of Botany And Microbiology, College Of Science, King Saud University, Riyadh, Saudi Arabia
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Two ornamental plants, namely Canna indicia and Euphorbia milii were subjected to four watering frequencies viz. daily, weekly, biweekly and monthly, each with five watering regimes (1.25%, 2.5%, 5%, 10% and 20%). After six weeks of watering, leaf area and 2 2 transpiration rate of the seedlings were determined. The leaves were larger in C. indica ranging from (105 mm – 436 mm ) than in E. 2 2 4 -2 -1 -3 -2 -1 milii (36 mm – 142 mm ) while transpiration rates were higher in E. milii (1.78x10 mol/m /sec – 2.56x10 mol/m /sec ) than in C. -4 -2 -1 -5 -2 -1 indica (2.48x10 mol/m /sec – 3.70x10 mol/m /sec ). Leaf area has no effect on the rate of transpiration in these two plants, but absence of evidence of transpiration on the adaxial surface of leaves of E. milii suggests that other anatomical features such as stomata rather than the leaf area might determine the rate of transpiration in plants.[Download]