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Plant Science: Under what environmental conditions will the water in the xylem be under a lot...

Plant Science: Under what environmental conditions will the water in the xylem be under a lot of tension (lots of “pull”; very negative water potential)?

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Answer #1

Water potential of pure water is 0.

Water potential of any solution is negative

Greater the solute concentration, more negative is the water potential.

When transpirational pull is more, water is removed from plant leaves extensively, so the solute concentration in the tissue increases, that means water potential becomes more negative.

So in arid conditions, high temperature and breezy conditions transpiration pull is maximum.

Hence water pull is more in xylem under a lot of stress.

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