Question

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The opening of the guard cells in stomata is regulated by _____________ . ​

Answer 1

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ᴅᴜʀɪɴɢ ᴛʜᴇ ᴏᴘᴇɴɪɴɢ ᴏғ ᴛʜᴇ sᴛᴏᴍᴀᴛᴀ, ᴛʜᴇ ʜ+-ᴀᴛᴘᴀsᴇ ᴘᴜᴍᴘ ᴍᴇᴅɪᴀᴛᴇs ᴛʜᴇ ᴇғғʟᴜx ᴏғ ʜ+ ғʀᴏᴍ ᴛʜᴇ ɢᴜᴀʀᴅ ᴄᴇʟʟs. ɪɴ ᴘʟᴀɴᴛs, ʜ+-ᴀᴛᴘᴀsᴇs ʙᴇʟᴏɴɢ ᴛᴏ ᴛʜᴇ ᴍᴜʟᴛɪ-ɢᴇɴᴇ ғᴀᴍɪʟʏ ᴏғ ᴛʜᴇ ᴘ-ᴛʏᴘᴇ ᴀᴛᴘᴀsᴇs, ᴡɪᴛʜ 11 ɢᴇɴᴇs ɪɴ ᴀʀᴀʙɪᴅᴏᴘsɪs, ᴡʜɪᴄʜ ᴀʀᴇ ᴀʟʟ ᴇxᴘʀᴇssᴇᴅ ɪɴ ᴛʜᴇ ɢᴜᴀʀᴅ ᴄᴇʟʟs (ᴜᴇɴᴏ ᴇᴛ ᴀʟ., 2005).13-ᴍᴀʏ-2013

Answer 2

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ABA Signaling in Guard Cells. ABA is a plant hormone that is involved in the plant response to drought. As the soil dries, ABA builds up in the leaves and stomata close. This is beneficial to the plant as it allows it to conserve water.

Guard cells optimise leaf gas exchange in response to changing environmental conditions and their turgor is controlled by alterations in atmospheric CO2 concentration, light intensity, humidity and the drought hormone abscisic acid.

The guard cells regulate the opening and closing of stomatal pores by the osmosis process. When water flows into the guard cells, they swell up and the curved surface causes the stomata to open. When the guard cells lose water, they shrink and become flaccid and straight thus closing the stomata

hope it's helpful⭐✨

$\huge\sf\underline\red{answered\:by\:KIMU}$

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