Author(s):

Parashuram M, KR Rajadurai and S Haripriya

Abstract: The present investigation was under taken to study the physiological and biochemical parameters of nerium cultivars (Nerium oleander L.) such as leaf area, chlorophyll and proline content, observation on trichromes and stomata at Department of Floriculture and Landscaping, Horticulture College and Research Institute, Tamil Nadu Agricultural University, Coimbatore in the year 2016-2017. Among the parameters studied highest leaf was recorded in the Pink cultivar followed by Red cultivar and the least in Yellow cultivar. Chlorophyll content is the major factor which influences flower yield. The highest chlorophyll content was recorded in Pink cultivar and the lowest chlorophyll content recorded in Yellow cultivar. Proline content is one of the important amino acid which will give resistance to abiotic stresses. Among the cultivars highest proline content was recorded in Yellow cultivar followed by White cultivar while least proline content was recorded in Pink cultivar. Stomatal observations of nerium cultivar was done on both upper and lower surface of the leaf there was no much differences was observed among the cultivars. In all the cultivars of nerium there is no stomata was observed on upper surface of the leaf. The stomatal crypt was observed on lower surface of the leaf in all nerium cultivars. Around the stomatal crypt, many number of stomata were distributed. In lower surface of the leaves trachoma’s were found densely in all the cultivars. Stomata were found at the base of the trichromes on lower surface of the leaves. These preliminary data will be useful in order to examine the physiological and biochemical studies in nerium in future days.

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