Physiological aspects of date palm loading and alternate bearing under regulated deficit irrigation compared to cutting back of bunch

Alikhani-Koupaei, Majid; Aghdam, Morteza Soleimani; Faghih, Somayeh

doi:10.1016/j.agwat.2020.106035

Cited by 6 publications

(4 citation statements)

References 35 publications

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“…Sink limitation reduces the need for carbohydrates, which increases starch reserves. 5,13,16 This study shows that carbohydrate reserves increase with thinning, demonstrating the effect of thinning on source-sink limitation. Differences in the level of carbohydrates in trees may be related to their storage in thinned trees, as well as their transfer to additional sinks in On-trees.…”

Section: Discussionmentioning

confidence: 51%

“…Source‐limited trees reduce starch as a result of synthesizing more soluble sugars for additional sinks. Sink limitation reduces the need for carbohydrates, which increases starch reserves 5,13,16 . This study shows that carbohydrate reserves increase with thinning, demonstrating the effect of thinning on source–sink limitation.…”

Section: Discussionmentioning

confidence: 53%

“…3 Hababuks are given preference in this allocation as soon as they are formed because they are the primary sink under the influence of hormones. 4,5 Sink activity depends on the rate of absorption of photosynthetic materials per unit of weight and tissue, as well as the size and total weight of the tissue. Altering the size or activity of the sink affects the transport pattern.…”

Section: Introductionmentioning

confidence: 99%

“…Various factors, such as the accumulation of auxin, cytokinin, and gibberellin hormones in the fruits and the intensity of the metabolic activity of converting sucrose into storage materials, contribute to the partitioning of photosynthetic materials in the plant 3 . Hababuks are given preference in this allocation as soon as they are formed because they are the primary sink under the influence of hormones 4,5 . Sink activity depends on the rate of absorption of photosynthetic materials per unit of weight and tissue, as well as the size and total weight of the tissue.…”

Section: Introductionmentioning

confidence: 99%

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Reducing the sink/source ratio of on‐date palm plants during fruit growth has physiological and biochemical impacts on the shift in source–sink limitations

Alikhani-Koupaei¹,

Nia

2023

J Sci Food Agric

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BACKGROUNDThe present study examined the impact of reducing the ‘sink’ on the ‘source’ in On‐palms with a bunch number greater than eight. The capacity of leaves and fruit, as well as assimilate loading and unloading in phloem, restrict plant growth and yield. The study evaluated yield components, as well as photosynthetic and hormonal feedback, resulting from source–sink relationships.RESULTSDuring the mid‐Kimri, removing bunches from On‐trees stabilized yield components and fruit size, suggesting that On‐trees have a sink limitation. Bunch thinning boosted these indicators compared to normal trees with a bunch number between six and eight inclusive, indicating that On‐trees had source limitations. In mid‐Khalal, the treatments presented a type of source and sink limitation that is opposite to mid‐Kimri. The thinning techniques addressed the source–sink limitation by adjusting the additional carbon allocation. This resulted in an increase of non‐reducing sugars and starch in different organs, whereas reducing sugars decreased. These adjustments were made to reduce sucrose‐phosphate synthase and sucrose synthase activity, raising invertase activity, lowering indole‐3‐acetic acid, zeatin, gibberellin, and abscisic acid hormone levels in fruits, as well as lowering trehalose production in organs. Levels of hormones, enzymes, and trehalose showed less variation during bunch thinning and source limitation compared to bunch removal and sink limitation.CONCLUSIONAt Rutab, thinning types demonstrated the source limitation of On‐trees. Bunch removal and bunch thinning by removing the source–sink limitation had the greatest effect on increasing yield components and fruit size, respectively. To improve the quality and quantity of fruit, it is important to use both thinning techniques simultaneously. © 2023 Society of Chemical Industry.

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Section: Discussionmentioning

confidence: 51%

Section: Discussionmentioning

confidence: 53%