Water stress and crop load effects on fruit fresh and dry weights in peach (Prunus persica)

SUMMARYAdult early maturing peach trees (Prunus persica(L.) Batsch cvar Flordastar) grafted ontoP. persica×Prunus amygdalusGF-677 peach rootstock, were subjected to low water availability (water stress) and recovery periods for 28 and 7 days, respectively, during summer 2009. Control plants were irrigated daily at 1·3 estimated crop reference evapotranspiration (ETC) in order to obtain non-limiting soil water conditions. Active osmotic adjustment was observed at the end of the stress period. However, the magnitude of this osmotic adjustment (0·18 MPa) was not sufficient to modify the leaf water potential at turgor loss point. The observed active osmotic adjustment that maintained turgor was in contrast to other results in potted peach trees, where no osmotic adjustment was observed, and highlights the importance of field studies in which water stress is developed gradually over a prolonged period. Relative apoplastic water content (RWCa) values were high and decreased as a result of water stress. The rapid decrease in leaf conductance from the beginning of the stress period, together with the delay in stomatal reopening after rewatering, indicated that stomatal behaviour was not a simple passive response to water deficit. The results indicate that drought resistance in early maturing peach trees is based both on avoidance mechanisms, such as stomatal control and tolerance mechanisms, including active osmotic adjustment and high RWCa.

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INFLUENCE OF WATER STRESS AND CROP LOAD ON THE PHYSIOLOGY AND THE PRODUCTIVITY OF TEMPRANILLO UNDER SEMIARID CONDITIONS

Acta Horticulturae ◽

10.17660/actahortic.2004.640.10 ◽

2004 ◽

pp. 99-106

Author(s):

J.A. Rubio ◽

M.V. Alburquerque ◽

J. Yuste

Keyword(s):

Water Stress ◽

Crop Load ◽

Influence Of Water ◽

Semiarid Conditions

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Effect of chemical thinning, gibberellic acid and pruning on growth and production of nectarine (Prunus persica (L.) Batsch var. nucipersica) cv. May fire

Journal of Applied and Natural Science ◽

10.31018/jans.v9i1.1192 ◽

2017 ◽

Vol 9 (1) ◽

pp. 332-337

Author(s):

Rimpika Rimpika ◽

N. Sharma ◽

D.P. Sharma

Keyword(s):

Acetic Acid ◽

Gibberellic Acid ◽

Shoot Growth ◽

Prunus Persica ◽

Tree Height ◽

Naphthalene Acetic Acid ◽

Crop Load ◽

Fruit Drop ◽

Alternative Approach ◽

Old Trees

The present investigation was carried out on 12-year old trees of nectarine (Prunus persica (L.) Batsch var. nucipersica) cultivar May Fire raised on wild peach seedling rootstocks, Farmer’s orchard at Kotla- Barog in District Sirmour during the years 2014 and 2015. In this experiment, experimental trees were subjected to seventeen different treatments;T1: Pruning to retain 60 fruiting shoots tree-1 (control), T2: Pruning to retain 50 fruiting shoots tree-1, T3: Pruning to retain 40 fruiting shoots tree-1 ,T4: NAA 40 ppm, 2 WAPF (week after petal fall) ,T5: Ethrel 300 ppm, 2 WAPF, T6: GA3 100 ppm, 4 WAPF, T7: GA3 200 ppm, 4WAPF, T8: GA3 100 ppm, 6 WAPF T9: GA3 200 ppm, 6 WAPF, T10: Pruning to retain 50 fruiting shoots tree-1 + NAA 40 ppm (T4), T11: Pruning to retain 50 fruiting shoots tree-1 + Ethrel 300ppm (T5), T12: Pruning to retain 50 fruiting shoots tree-1 + GA3100 ppm (T6), T13: Pruning to retain 50 fruiting shoots tree-1 + GA3 100 ppm (T8),T14: Pruning to retain 40 fruiting shoots tree-1 + NAA 40 ppm (T4), T15: Pruning to retain 40 fruiting shoots tree -1 +Ethrel 300 ppm (T5),T16: Pruning to retain 40 fruiting shoots tree -1 + GA3 100 ppm (T6), T17: Pruning to retain 40 fruiting shoots tree -1 + GA3 100 ppm (T8), pertaining to alternative approach to chemical thinning, chemical thinner were more effective in improving the production of superior grade fruits than reducing the crop load directly by pruning or indirectly by GA 3 (Gibberellic Acid) treatments. Treatments with NAA (naphthalene acetic acid) at 40 ppm when applied two weeks after petal fall reduced the crop load to the greatest extent and improve the yield of superior grade fruits and increase the leaf to fruit ratio and decrease the fruit drop. Pruning to retain 40 fruiting shoots tree-1 + NAA 40 ppm, 2WAPF increased the shoot growth (160.80, 170.20cm), tree height (3.70,4.50 cm), tree spread (2.84,3.60), leaf area (42.71, 40.63 cm) during both the year. However, effect of chemical were less pronounced on trees subjected to severe pruning.

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Effects of Crop Load on Water Stress, Fruit Quality, Yield and Flower Bud Formation on Root-Restricted Wase Satsuma Mandarin Trees Grown Indoors

Engei Gakkai zasshi ◽

10.2503/jjshs.63.745 ◽

1995 ◽

Vol 63 (4) ◽

pp. 745-752 ◽

Cited By ~ 1

Author(s):

Daijirou Yahata ◽

Yoshiki Oba ◽

Minoru Kuwahara ◽

Kazunori Matsumoto

Keyword(s):

Water Stress ◽

Fruit Quality ◽

Flower Bud ◽

Crop Load ◽

Bud Formation ◽

Satsuma Mandarin ◽

Flower Bud Formation

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Peach Fruit Weight, Yield, and Crop Value Are Affected by Number of Fruiting Shoots per Tree

HortScience ◽

10.21273/hortsci.38.4.512 ◽

2003 ◽

Vol 38 (4) ◽

pp. 512-514 ◽

Cited By ~ 9

Author(s):

Richard P. Marini

Keyword(s):

Prunus Persica ◽

Fruit Set ◽

Fruit Weight ◽

Peach Fruit ◽

Crop Load ◽

Weight Yield ◽

Thinning Operation ◽

Tree Number ◽

Number Of Shoots

Mature `Norman'peach [Prunus persica (L.) Batsch] trees were dormant pruned to retain a range of fruiting shoots per tree (71 to 250) during 3 years from 1997 to 1999. About 40 days after bloom each year, fruits on all trees were thinned to similar crop loads, so only the number of fruits per shoot varied. Fruit set and number of fruits removed by hand thinning were positively related to number of fruiting shoots retained per tree. Number of fruits harvested per tree was not related to number of shoots per tree, whereas average fruit weight at thinning and at harvest, and crop value per tree were negatively related to the number of shoots retained per tree. These results indicate that commercial peach producers should consider modifying pruning and thinning strategies. Rather than retaining a large number of fruiting shoots per tree and hand thinning to distribute fruits every 15 to 20 cm along each fruiting shoot, producers should first determine the number of fruits that trees of a given cultivar can adequately size and then perform the thinning operation to obtain the desired crop load. The number of fruiting shoots retained per tree during pruning should be one-fifth to one-seventh of the number of fruits desired per tree, so that five to seven fruits per fruiting shoot are retained after hand thinning.

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