Modelling kiwifruit growth: impact of pollination period on fruit growth dynamic

In the last decade, apple has been intensively cultivated in the western coast of Albania. The scope of this research was to study the influence of M9 rootstock on the reproductive behaviour of apple cultivars ‘M. Gala’, ‘Golden Delicious’, ‘Starking’, ‘Fuji’ and ‘Pink Lady’. The trial was conducted from 2010 – 2011 in 5-year old orchards with 2,250 trees/ha grown as French axe and in full production located in Lushnja. The following indicators were measured: diameter of two main branches, number of fruits/branch, fruit growth dynamic and sugar content (%). Global radiation, temperature and humidity were recorded. The reproduction behaviour has also been measured by fruiting spurs in the general structure of the canopy as well as the number of fruits formed for each cultivar. The results have shown that in terms of fruit set, cultivars are ranked as follows: ‘M. Gala’ with the highest number of fruits, then ‘Golden Delicious’, ‘Fuji’, ‘Pink Lady’ and ‘Starking’, respectively. The dynamic of fruit dropping shows that ‘Starking’, having the lowest fruit set, after the June drop is more stable while ‘M. Gala’, with the highest fruit set, besides an abundant June drop, had another drop in July. This is due to higher competition among the fruits and failure of the rootstock to supply the adequate quantities of sap. In terms of fruit growth dynamic, it was observed that intensive growth was measured for all the cultivars during the end of July after which fruit growth slowed down. Changes between cultivars were observed in relation to the maturation period of each cultivar, with ‘M. Gala’ maturing in August, ‘Fuji’ and ‘Pink Lady’ in October and November. ‘Starking and ‘Golden Delicious’ cultivars had a more rapid maturation (20 September), accompanied with a higher sugar content which is far more related to climatic factor rather than M9 rootstock. In conclusion, it was found that the cultivars under study have different reproductive behaviour with M9 rootstock. It can also be stated that ‘Starking’ is not appropriate for this coastal region due to inadequate fruiting behaviour.

Download Full-text

The synephrine content of Shiikuwasha (Citrus depressa HAYATA) fruit: Analytical method and change during fruit growth

Planta Medica ◽

10.1055/s-0028-1084638 ◽

2008 ◽

Vol 74 (09) ◽

Author(s):

K Miyagi ◽

T Fujise ◽

N Koga ◽

K Wada ◽

M Yano ◽

...

Keyword(s):

Analytical Method ◽

Fruit Growth ◽

Citrus Depressa

Download Full-text

Effect of Strapping Lateral Branches of Japanese Persimmon 'Saijo' with Wires Before Full Bloom on Fruit Growth and Carbohydrate Accumulation of Leaves and Stems.

Engei Gakkai zasshi ◽

10.2503/jjshs.71.783 ◽

2002 ◽

Vol 71 (6) ◽

pp. 783-788 ◽

Cited By ~ 1

Author(s):

Kojiro Hasegawa ◽

Norio Takayama ◽

Akira Kitajima

Keyword(s):

Fruit Growth ◽

Full Bloom ◽

Carbohydrate Accumulation ◽

Japanese Persimmon ◽

Lateral Branches

Download Full-text

Faculty Opinions recommendation of Evidence for karyoplasmic homeostasis during endoreduplication and a ploidy-dependent increase in gene transcription during tomato fruit growth.

Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature ◽

10.3410/f.717970788.793469275 ◽

2013 ◽

Author(s):

Lieven De Veylder

Keyword(s):

Gene Transcription ◽

Tomato Fruit ◽

Fruit Growth

Download Full-text

Interaction Between CPPU and NAA on Fruit Thinning and Fruit Development in Selected Apple Cultivars

HortScience ◽

10.21273/hortsci.33.3.513c ◽

1998 ◽

Vol 33 (3) ◽

pp. 513c-513 ◽

Cited By ~ 1

Author(s):

Martin J. Bukovac ◽

Jerome Hull ◽

John C. Neilsen ◽

Michael Schroeder ◽

Georg Noga

Keyword(s):

Total Yield ◽

Fruit Size ◽

Frost Damage ◽

Fruit Growth ◽

Soluble Solids ◽

Seed Number ◽

Crop Load ◽

Fruit Thinning ◽

Carpel Development ◽

Return Bloom

NAA is used extensively for fruit thinning of apples to increase fruit size and to promote return bloom. In some cultivars, even if thinning is achieved, fruit size at harvest may be less than expected based on crop load. CPPU, N-(2-chloro-4-pyridinyl)-N.-phenylurea, has been shown to increase fruit growth in apples, grapes, and kiwi. We evaluated combinations of NAA and CPPU on thinning, fruit growth and return bloom in Redchief `Delicious', `Elstar', and `Gloster'. CPPU was applied at 5 mgμL–1 (based on 0 to 10 mgμL–1 response curve) in combination with 15 mgμL–1 NAA as high-volume sprays at 7 to 10 mm KFD. Yield and fruit size distribution (on total yield) were used as index of response. In `Delicious', CPPU (3-year study) increased % large (70 mm+) fruit, but in the presence of NAA % large fruit was reduced 2 of the 3 years. CPPU did not induce significant thinning. There were no significant effects on color or soluble solids; firmness was increased slightly and seed number reduced. The L/D ratio was increased and uneven lobe and carpel development was common. CPPU had no significant effect on return bloom in presence or absence of NAA, but NAA increased bloom in both the presence and absence of CPPU. With `Elstar' (2-year study) there was no significant thinning with either chemical, but CPPU increased mean fruit size and % large (70–80 mm) fruit over nonthinned, but not significantly greater than NAA alone. There were no significant differences in firmness, color, soluble solids or seed number. NAA + CPPU did not inhibit fruit growth or cause excessive uneven carpel development. Frost damage reduced crop load in `Gloster' where results were similar to `Elstar' except seed number was reduced by the NAA + CPPU combination.

Download Full-text

Pollen grain hormones of date palm pollinator cultivars and their relationship with hormones of different stages of ‘Piarom’ date fruit growth

Scientia Horticulturae ◽

10.1016/j.scienta.2021.110389 ◽

2021 ◽

Vol 288 ◽

pp. 110389

Author(s):

Ali Reza Shahsavar ◽

Asma Shahhosseini

Keyword(s):

Date Palm ◽

Pollen Grain ◽

Fruit Growth ◽

Date Fruit

Download Full-text

Is There Daily Growth Hysteresis versus Vapor Pressure Deficit in Cherry Fruit?

Horticulturae ◽

10.3390/horticulturae7060131 ◽

2021 ◽

Vol 7 (6) ◽

pp. 131

Author(s):

Matteo Zucchini ◽

Arash Khosravi ◽

Veronica Giorgi ◽

Adriano Mancini ◽

Davide Neri

Keyword(s):

Vapor Pressure ◽

Vapor Pressure Deficit ◽

Fruit Growth ◽

Hysteresis Curve ◽

Growth Stages ◽

Fourth Stage ◽

The Third ◽

Third Stage ◽

Rainy Days ◽

Clockwise Hysteresis

The growth of cherry fruit is generally described using a double sigmoid model, divided into four growth stages. Abiotic factors are considered to be significant components in modifying fruit growth, and among these, the vapor pressure deficit (VPD) is deemed the most effective. In this study, we investigated sweet cherry fruit growth through the continuous, hourly monitoring of fruit transversal diameter over two consecutive years (2019 and 2020), from the beginning of the third stage to maturation (forth stage). Extensometers were used in the field and VPD was calculated from weather data. The fruit growth pattern up to the end of the third stage demonstrated three critical steps during non-rainy days: shrinkage, stabilization and expansion. In the third stage of fruit growth, a partial clockwise hysteresis curve of circadian growth, as a response to VPD, appeared on random days. The pattern of fruit growth during rainy days was not distinctive, but the amount and duration of rain caused a consequent decrease in the VPD and indirectly boosted fruit growth. At the beginning of the fourth stage, the circadian growth changed and the daily transversal diameter vs VPD formed fully clockwise hysteresis curves for most of this stage. Our findings indicate that hysteresis can be employed to evaluate the initial phenological phase of fruit maturation, as a fully clockwise hysteresis curve was observable only in the fourth stage of fruit growth. There are additional opportunities for its use in the management of fruit production, such as in precision fruit farming.

Download Full-text