Effect of Alternaria alternata (Fr.) Keissl. on the physiology of Pea (Pisum sativum L.)

• Kashifa Noureen Department of Botany, Lahore College for Women University, Jail Road, Lahore, Pakistan https://orcid.org/0000-0002-8155-0850
• Khajista Jabeen Department of Botany, Lahore College for Women University, Jail Road, Lahore, Pakistan https://orcid.org/0000-0002-8155-0850
• Sumera Iqbal Department of Botany, Lahore College for Women University, Jail Road, Lahore, Pakistan https://orcid.org/0000-0003-1797-2634
• Summera Jahan Department of Botany, Lahore College for Women University, Jail Road, Lahore, Pakistan. https://orcid.org/0000-0003-0001-8991
• Sumera Javad Department of Botany, Lahore College for Women University, Jail Road, Lahore, Pakistan https://orcid.org/0000-0002-4703-9610

Keywords: biotic stress, biochemical, blight, germination, pot experiment

Abstract

Alternaria alternata (Fr.) Keissl. is responsible for causing leaf spots and blight diseases on a large number of horticultural and agricultural crops including pea. The response and resistance of different pea varieties to this fungus might vary. Therefore, this study was aimed to investigate the varietal differences in the physiological response of Pisum sativum L. to A. alternata. Various physiological and biochemical parameters of two commercial pea varieties (Leina and Meature) were assessed at vegetative stage in pot experiment. Sterilized seeds were soaked in 1×10⁵ mL conidial suspension of A. alternata for 15 min and control seeds were soaked in sterilized water. These sterilized seeds were sown in pots containing sterilized soil. In both varieties, germination percentage, germination rate, seedling vigor index, root and shoot length, dry and fresh biomass, leaf sugar, chlorophyll a, b, total chlorophyll and carotenoid contents, leaf osmotic potential, leaf relative water content, significantly decreased under A. alternata stress as compared to control. But proline and protein content significantly increased. It is concluded from the results that A. alternata caused adverse effects on the physiology of pea plant. The tested pea variety Leina was found to be more sensitive under fungal stress of A. alternata as compared to Meature and the extent of stress caused by both test varieties can be exploited in future studies.

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