Abstract
Inflorescence leaves of citrus (Citrus sinensis L. Osbeck) accumulate carbohydrate reserves at the beginning of the fruit set period. This effect is mimicked by exogenous GA3 applications in deflorate inflorescences. The effect of the hormone on two processes that could result in carbohydrate accumulation, i.e. increased ribulose bisphosphate carboxylase (RuBPCase) activity and changes in the import/export balance of assimilates in the sprouts, was studied. Neither RuBPCase activity nor respiration rates were affected by the hormonal treatment. On the other hand, blocking of the phloem connections with the rest of the plant induced an increase in carbohydrate contents in the leaves that was proportionally lower in GA3-treated sprouts than in control deflorate inflorescences. This increase was minimal in leaves from inflorescences at later stages of fruit development. This was in spite of a lower fruit growth rate that, in turn, brought about a decrease in total dry weight of the sprout. In contrast, total dry weight was higher in girdled deflorate inflorescences, whether or not they were treated with the hormone. The presence of the fruit induced a thickening of the stems of intact inflorescences that was also seen in ungirdled GA2-treated sprouts. This increase in dry weight per unit length, however, had a different chemical basis depending upon whether it was caused by the fruit or the hormone. From these data, the possible causes for the enhancement of carbohydrate accumulation in inflorescence leaves, and the involvement of gibberellin in the effect of fruit on the sprouts is discussed.
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Claims 10
Claim · model-written summary
Citrus inflorescence leaves accumulated carbohydrate reserves at fruit set.
CitrusOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Inflorescence leaves of citrus (Citrus sinensis L. Osbeck) accumulate carbohydrate reserves at the beginning of the fruit set period”
Claim · model-written summary
Exogenous GA3 mimicked carbohydrate accumulation in deflorate inflorescences.
- Organ / stage
- deflorate inflorescencese0
- Treatment
- exogenous GA3 applicationse0
- Outcome
- carbohydrate reservese1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This effect is mimicked by exogenous GA3 applications in deflorate inflorescences”
e1“accumulate carbohydrate reserves”
e2“citrus (Citrus sinensis L. Osbeck)”
Claim · model-written summary
GA3 did not affect RuBPCase activity or respiration rates.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Neither RuBPCase activity nor respiration rates were affected by the hormonal treatment”
e1“citrus (Citrus sinensis L. Osbeck)”
Claim · model-written summary
Phloem blocking increased leaf carbohydrate content, proportionally less in GA3-treated sprouts than controls.
- Treatment
- blocking of the phloem connectionse0
- Outcome
- carbohydrate contents in the leavese0
- Direction
- increasee0
- Qualifier
- proportionally lower in GA3-treated sproutse0
- Comparator
- control deflorate inflorescencese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“blocking of the phloem connections with the rest of the plant induced an increase in carbohydrate contents in the leaves that was proportionally lower in GA3-treated sprouts than in control deflorate inflorescences”
e1“citrus (Citrus sinensis L. Osbeck)”
Claim · model-written summary
At later fruit development, the leaf carbohydrate increase was minimal.
- Organ / stage
- leaves from inflorescences at later stages of fruit developmente0
- Outcome
- increasee0
- Direction
- minimale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This increase was minimal in leaves from inflorescences at later stages of fruit development”
e1“citrus (Citrus sinensis L. Osbeck)”
Claim · model-written summary
A lower fruit growth rate decreased total sprout dry weight.
- Organ / stage
- fruite0
- Outcome
- total dry weight of the sproute0
- Direction
- decreasee0
- Qualifier
- lower fruit growth ratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a lower fruit growth rate that, in turn, brought about a decrease in total dry weight of the sprout”
e1“citrus (Citrus sinensis L. Osbeck)”
Claim · model-written summary
Girdled deflorate inflorescences had higher dry weight regardless of hormone treatment.
- Organ / stage
- deflorate inflorescencese0
- Treatment
- girdlede0
- Outcome
- total dry weighte0
- Direction
- highere0
- Qualifier
- whether or not they were treated with the hormonee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“total dry weight was higher in girdled deflorate inflorescences, whether or not they were treated with the hormone”
e1“citrus (Citrus sinensis L. Osbeck)”
Claim · model-written summary
Fruit presence thickened stems of intact inflorescences.
- Organ / stage
- intact inflorescencese0
- Treatment
- presence of the fruite0
- Outcome
- thickening of the stemse0
- Direction
- thickeninge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The presence of the fruit induced a thickening of the stems of intact inflorescences”
e1“citrus (Citrus sinensis L. Osbeck)”
Claim · model-written summary
Ungirdled GA2-treated sprouts also showed stem thickening.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“also seen in ungirdled GA2-treated sprouts”
e1“thickening of the stems of intact inflorescences”
e2“citrus (Citrus sinensis L. Osbeck)”
Claim · model-written summary
Fruit and hormone caused dry weight per length increases with different chemical bases.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This increase in dry weight per unit length, however, had a different chemical basis depending upon whether it was caused by the fruit or the hormone”
e1“citrus (Citrus sinensis L. Osbeck)”