Abstract
Medicinal and aromatic plants have the ability to transmit volatile allelochemicals and affect their surrounding organisms. In this regard, their interaction should also be considered. Allelopathy can be widely used in agricultural practices considering their profound role in seed germination. The study presented in this work was designed to evaluate the allelopathic effects of Glycosmis pentaphylla (Retz.) DC. on the growth of a monocot plant Triticum aestivum (L.) and a dicot plant Vigna radiata (L.) Wilczek. This is the first report of a study on allelopathy in Glycosmis pentaphylla. Aqueous leaf extracts were used for the study. Parameters like germination percentage, plumule length, radical length, vigour index and percentage phytotoxicity of the seedlings were determined in a paper test. Concentration of the extract ranging from 2-10 ml along with a control was made to germinate the seedlings. The results were statistically tested by one-way ANOVA. The results revealed that, except for percentage phytotoxicity, all the parameters were indirectly proportional to the concentration of the extract applied. On the other hand, the percentage phytotoxicity was directly proportional to the concentration of the extract. The germination percentage (101.0±0.70), plumule length (8.51±0.005), vigour index (851.2±0.58) and percentage phytotoxicity (65.52±0.005) were found maximum for Vigna radiata than Triticum aestivum. On the other hand, T. aestivum showed the highest value for radicle length which was 3.20± 0.06. Hence, it can be gleaned from the results that, the dicot plant showed maximum growth due to the allelochemicals obtained from G. pentaphylla. As the study plants belong to the family Rutaceae, which is highly rich in aromatic oils, this might be a probable reason for the growth of test plants. The present study also indicates that, the allelochemicals released from G. pentaphylla were also responsible for the induction of variation in the germination of seedlings.
Highlights
Allelopathy is defined as process where a plant secretes allelochemicals which can directly or indirectly affect the growth of the nearby plants
An important medicinal plant G. pentaphylla was used to check its allelopathic potential on a monocot plant wheat and a dicot plant mung bean
The results of the present study indicates that the aqueous leaf extract of G. pentaphylla has profound effect on the growth and germination of Triticum aestivum and Vigna radiata
Summary
Allelopathy is defined as process where a plant secretes allelochemicals which can directly or indirectly affect the growth of the nearby plants. On Triticum aestivum (L.) and Vigna radiata (L.) Wilczek present work, a comparison has been made using allelochemicals secreted by leaf of Glycosmis pentaphylla between a monocot plant Triticum aestivum (wheat) and a dicot plant Vigna radiata (mung bean). The family Rutaceae contains about 100 genera and 800 species of herbs and G. pentaphylla is a shrub or a small trees [2]. The test crops used for the study were T. aestivum and V. radiata These plants were selected as they possessed rapid germination and growth within a limited period of time. Both these test crops are richest source of nutrition as they contain essential elements for growth and survival of human beings. The present study deals with alleopathic potential of G. pentaphylla on wheat and mung bean
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