Fruit Set, Seed Set and Fruit Weight in Apple as Influenced by Emasculation, Self-Pollination and Cross-Pollination

Net Enclosure of ‘Honeycrisp’ and ‘Gala’ Apple Trees at Different Bloom Stages Affects Fruit Set and Alters Seed Production

“…Similar observations were drawn by Dorigoni and Micheli (2015) whose experimental trials report 'Gala' as recalcitrant to thinning by a single-row netting system. Our data, in combination with [30], support the previously described partial self-fertility of 'Gala' [15]. In 2017, fruit set of non-netted 'Gala' trees was lower than normal and did not require thinning, presumably due to a spring frost event that occurred between full bloom and petal fall (−4 • C sustained for 4 h, Figure 4A).…”

“…Alternatively, fruit set under nets may have been due to partial self-fertility. Self-fruitful cultivars of apple do exist, the most notable being 'Golden Delicious' and 'Idared' [44] as well as 'Gala' (15). Indeed, fruit set of 'Golden Delicious' approached full crop potential when netted prior to bloom, though information on the number and type of seeds present in those fruit was not reported [30,37].…”

“…Nevertheless, some apple cultivars show self-compatible alleles [14]. In other cases, varying levels of self-compatibility were observed among 'Golden Delicious', 'Fuji', 'Gala', 'Cox's Orange Pippin', and 'Elstar' [15]. When S-RNAase gene expression was repressed in the pistil, self-fertility occurred in two transgenic apple lines leading to self-pollination and fertilization [16].…”

The influence of polleniser on biological properties and quality of apple (Malus domestica Borkh.) fruits

“…Uticaj oprašivača na zametanje i kvalitet plodova je dosta proučavan kod jabuke (Jonkers et al, 1978;Brault i de Oliveira, 1995;De Witte et al, 1995;Keulemans et al, 1996;Buccheri i Vaio, 2004;Tóth et al, 2005;Bodor et al, 2008). U ranijem periodu, istraživanja su uglavnom bila usredsređena na utvrđivanje efekta metaksenije na masu i dimenzije ploda, dok je danas efekat metaksenije ustanovljen i na kvalitetu ploda i postaje sve značajniji.…”

“…Iste sorte u funkciji oprašivača su uticale i na najveće dimenzije ploda ispitivanih sorti. Keulemans et al (1995) navode slične podatke, tvrdeći da pojedini oprašivači indukuju sistematski krupnije plodove u odnosu na neke druge. Isti autori navode da je sorta 'Fuji' u najvećem broju ispitivanih kombinacija doprinela najvećoj masi ploda, u poređenju sa drugim oprašivačima, dok su najmanju masu ploda indukovale sorte 'Delcorf', 'Fiesta' i 'Rubinette'.…”