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Differential response of lemon balm (Melissa officinalis L.) and basil (Ocimum basilicum L.) to the impact of drought and root submergence

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Baczek-Kwinta R., Tokarz K., Czyczylo-Mysza I.

Zeszyty Problemowe Postępów Nauk Rolniczych

2008

tom 524

The response of aerial parts of lemon balm and basil to 7-day soil drought and root submergence (waterlogging) was studied. Drought-subjected basil plants inhibited the growth of their shoots, and water content in leaves dropped to ca. 60% of leaf fresh weight, whereas growth of lemon balm was not affected and water content was ca. 70%. Gas exchange of lemon balm was stopped, which was considered an adaptive feature, and fluorescence parameters of chlorophyll a (Fv/Fm and Fv/F0) were not influenced. On the contrary, basil had its transpiration rate, stomatal conductance, and fluorescence parameters at the level of 40% of control, and CO2 exchange switched from net photosynthesis to respiration. In the case of waterlogging, neither gas exchange, nor other parameters of lemon balm were altered, revealing insensitivity of plants to hypoxic stress, whereas gas exchange of basil was ca. 1/3 of the control. Both treatments increased anthocyanin content in lemon balm leaves, which may partially contribute to the resistance of this species to photooxidative conditions triggered by water stress.

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1 Zeszyty Problemowe Postępów Nauk Rolniczych

1 Baczek-Kwinta R.

1 Czyczylo-Mysza I.

1 Tokarz K.

1 2008

Wyniki wyszukiwania

Differential response of lemon balm (Melissa officinalis L.) and basil (Ocimum basilicum L.) to the impact of drought and root submergence