Normally fruits fall during night than during day. Any reason fro fruit abscision
The answer may have a hydraulic component. Overnight the flow of water from the plant to the atmosphere is close to zero, then the plant-soil water potentials gradually approaching, increasing the cell turgor and hence the probability of abscission by processes similar to cherry fruit cracking.
As a general rule roots grow during the day and shoots grow at night. So if this applies to trees bearing fruit maybe there is your answer. There ought to be a more useful explanation based on abscission and activity of PGRs in the literature somewhere.
The answer may have a hydraulic component. Overnight the flow of water from the plant to the atmosphere is close to zero, then the plant-soil water potentials gradually approaching, increasing the cell turgor and hence the probability of abscission by processes similar to cherry fruit cracking.
Production of CO2 In night is more than in day time resulting to more synthesis of ethylene responsible for fruit ripening and fruit fall.
I think Marco has it - we have measured the circumference of apples throughout the day and night. Their growth mostly takes place at night as the humidity rises and the fruit don't have to 'fight' with the leaves for water. The higher hydraulic pressure should be expected to increase the pressures at the abscision zone. We have also found that small fruit are released from the plant best in the morning for similar reasons.
I think During the Night closed stomata Thus increasing the pressure on the Abscission layer Because the roots absorb water,
CH transportation in plants occurs especially at night. CH produced at day are transported to fruits at night. Small and weak developed fruits are fallen if produced CH couldn’t compensate all fruits requirements. That case occurs especially during high night temperatures. Because, respiration occurs more at warm nights and some part of produced CH is used up at respiration. Thus, fruits couldn’t compensate CH requirements are dropped more at night.
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