scholarly journals KODA and its Analog Treatment Effects on Flowering and Spring Shoot Occurrence in Satsuma Mandarin

HortScience ◽  
2016 ◽  
Vol 51 (2) ◽  
pp. 141-144
Author(s):  
Naoko Nakajima ◽  
Yoshinori Ikoma ◽  
Hikaru Matsumoto ◽  
Keiko Sato ◽  
Yuri Nakamura ◽  
...  
Keyword(s):  
Treatment Effects ◽  
Octadecadienoic Acid ◽  
Citrus Unshiu ◽  
Alternate Bearing ◽  
Flower Production ◽  
Satsuma Mandarin ◽  
Lemna Paucicostata ◽  
Discernible Effect

KODA [9-hydroxy-10-oxo-12(Z), 15(Z)-octadecadienoic acid] has previously been isolated from Lemna paucicostata, and is a compound known to promote flowering in plants. In this study, the effect of KODA on flower production and spring shoot occurrence in mature satsuma mandarin (Citrus unshiu Marc.) trees was examined in the field. The application of KODA in the summer or autumn had no discernible effect on flower production in the following year. However, when applied in summer, it promoted spring shoot occurrence in the following year, regardless of the number of flowers produced. In addition, C-KODA, a KODA analog, was more effective at producing this effect than KODA. The results suggest that the application of KODA or C-KODA may regulate spring shoot occurrence to improve the imbalance between the number of flower-bearing and vegetative shoots that leads to alternate bearing in satsuma mandarin trees.

Effects of rootstock and crop load on sap flow rate in branches of ‘Shirakawa Satsuma’ mandarin (Citrus unshiu Marc.)

2004 ◽  
Vol 102 (3) ◽  
pp. 295-300 ◽  
Author(s):  
Yoshimi Yonemoto ◽  
Kazunori Matsumoto ◽  
Tadashi Furukawa ◽  
Masaaki Asakawa ◽  
Hitoshi Okuda ◽  
...  
Keyword(s):  
Flow Rate ◽  
Sap Flow ◽  
Citrus Unshiu ◽  
Crop Load ◽  
Satsuma Mandarin

scholarly journals The Significance of Macronutrients in Alternate Bearing ‘Nadorcott’ Mandarin Trees

HortScience ◽  
2018 ◽  
Vol 53 (11) ◽  
pp. 1600-1609 ◽  
Author(s):  
Ockert P.J. Stander ◽  
Graham H. Barry ◽  
Paul J.R. Cronjé
Keyword(s):  
Treatment Effects ◽  
Foliar Spray ◽  
Shoot Development ◽  
Citrus Reticulata ◽  
Alternate Bearing ◽  
Vegetative Shoot ◽  
Current Season ◽  
Standard Practice ◽  
Main Determinants ◽  
Fruit Load

The significance of macronutrients nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), and magnesium (Mg) in leaves was studied in relation with their possible roles in alternate bearing of ‘Nadorcott’ mandarin (Citrus reticulata) trees over a period of three seasons. Fruit load (“on,” a heavy fruit load, vs. “off,” a light fruit load) affected the leaf macronutrient concentrations, and the amount of macronutrients removed through the harvest of fruit, i.e., the crop removal factor (g·kg−1), was consistent in both seasons. The crop removal factors were higher for each macronutrient in “off” trees—harvest of 1 kg fruit removed ≈2.3 g·kg−1 N, 0.3 g·kg−1 P, 3.1 g·kg−1 K, 1.0 g·kg−1 Ca, and 0.4 g·kg−1 Mg, compared with 1.3 g·kg−1 N, 0.2 g·kg−1 P, 1.7 g·kg−1 K, 0.6 g·kg−1 Ca, and 0.2 g·kg−1 Mg in “on” trees. Fruit load per tree (kg/tree) of 84, 110, and 52 kg/tree in “on” trees, however, removed ≈217 g/tree N, 28 g/tree P, 296 g/tree K, 100 g/tree Ca, and 35 g/tree Mg, which was 1.5–6 times more than that of fruit loads of 14, 71, and 16 kg/tree in “off” trees. In “off” trees, N, P, and K, and in “on” trees, Ca accumulated in leaves to between 20% and 30% higher concentrations in season 1, but the higher macronutrient status did not manifest in or consistently correlate with intensity of summer vegetative shoot development in the current season, or intensity of flowering in the next season, the two main determinants of fruit load in ‘Nadorcott’ mandarin. Apart from some anomalies, the concentrations of macronutrients in leaves were unaffected by de-fruiting and foliar spray applications of N and K to “on” trees, and showed no consistent relationship with treatment effects on parameters of vegetative shoot development and flowering. Leaf macronutrients in alternate bearing ‘Nadorcott’ mandarin trees, fertilized according to grower standard practice, are not related to differences in flowering and vegetative shoot development, and appear to be a consequence of fruit load and not a determinant thereof.

scholarly journals Predicting the Number of Flowers in Satsuma Mandarin (Citrus unshiu Marc.) Trees Based on Citrus FLOWERING LOCUS T mRNA Levels

2017 ◽  
Vol 86 (3) ◽  
pp. 305-310 ◽  
Author(s):  
Fumie Nishikawa ◽  
Mitsunori Iwasaki ◽  
Hiroshi Fukamachi ◽  
Tomoko Endo
Keyword(s):  
Citrus Unshiu ◽  
Mrna Levels ◽  
Flowering Locus T ◽  
Satsuma Mandarin ◽  
Flowering Locus

scholarly journals Leaf Carbohydrates and Flower Formation in Citrus

1995 ◽  
Vol 120 (2) ◽  
pp. 222-227 ◽  
Author(s):  
A. Garcia-Luis ◽  
F. Fornes ◽  
J.L. Guardiola
Keyword(s):  
Low Temperature ◽  
Induction Period ◽  
Flower Induction ◽  
Flower Formation ◽  
Citrus Unshiu ◽  
Satsuma Mandarin ◽  
Leaf Carbohydrates ◽  
Carbohydrate Levels ◽  
The Relationship ◽  
Carbohydrate Contents

The carbohydrate contents of the leaves of satsuma mandarin (Citrus unshiu Marc.) trees were altered before or during the low temperature flower induction period to determine the relationship between gross levels of carbohydrates and flower formation. Early removal of the fruit and girdling of the branches on either fruiting or defruited trees caused an accumulation of carbohydrates in the leaves and increased flower formation. Shading the trees resulted in a transient reduction in leaf carbohydrate levels and in a decrease in flower formation. Although a relationship between carbohydrate levels and flowering was consistently found, our results show that the gross levels of carbohydrates do not appear to limit flower formation in citrus.

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