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Outcrossing rate, yield, and selective fruit abscission in 'Ettinger' and 'Ardith' avocado plots
Year:
1997
Authors :
Degani, Chemda
;
.
El-Batsri, Ruth
;
.
Volume :
122
Co-Authors:
Degani, C., Inst. of Hort., Agric. Res. Org., Volcani Center, Bet-Dagan, Israel
El-Batsri, R., Inst. of Hort., Agric. Res. Org., Volcani Center, Bet-Dagan, Israel
Gazit, S., Inst. of Hort., Agric. Res. Org., Volcani Center, Bet-Dagan, Israel, Kennedy-Leigh Ctr. for Hort. Res., Hebrew University of Jerusalem, Rehovot, Israel
Facilitators :
From page:
813
To page:
817
(
Total pages:
5
)
Abstract:
The reciprocal effect of two avocado (Persea americana Mill.) cultivars-Ardith and Ettinger-on outcrossing rate and yield was studied in several orchards in Israel. Multilocus estimates of outcrossing rates were made using the isozyme loci Mdh-1 (malate dehydrogenase) and Aat-1 (aspartate aminotransferase) for 'Ettinger' progeny and Lap-2 (leucine aminopeptidase), Pgm-1 (phosphoglucomutase) and Tpi-1 (trinsephosphate isomerase) for 'Ardith' progeny. When the two cultivars were in close proximity, estimated yields ranged from 10 to 20 t·ha-1 and outcrossing rates ranged from 0.71 to 0.89 and from 0.87 to 0.90 for 'Ettinger' and 'Ardith', respectively. The effect of 'Ettinger' as a pollenizer was not restricted to adjacent 'Ardith' trees; it also reached more distant 'Ardith' trees. Thus, outcrossing rate in 'Ardith' was 0.82 a t a distance of 30 m from 'Ettinger' in one orchard and 0.91 at a distance of 36 m in another orchard. These results confirm previous observations that 'Ettinger' is a highly potent pollenizer. Outcrossing rates in 'Ardith' and 'Ettinger' were found to increase from the young fruitlet stage to that of mature fruit. These findings provide evidence for selective abscission of selfed fruitlets. In addition, parentage analysis of abscised versus retained 'Ardith' fruit showed that 'Ardith' selfed fruit abscised at a much higher rate than outcrossed ones. The survival advantage of outcrossed fruit is probably related to the fact that selfed progeny have less-vigorous embryos than outcrossed progeny due to inbreeding depression.
Note:
Related Files :
Inbreeding depression
Isozyme analysis
Persea americana
Productivity
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More details
DOI :
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
19288
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:27
Scientific Publication
Outcrossing rate, yield, and selective fruit abscission in 'Ettinger' and 'Ardith' avocado plots
122
Degani, C., Inst. of Hort., Agric. Res. Org., Volcani Center, Bet-Dagan, Israel
El-Batsri, R., Inst. of Hort., Agric. Res. Org., Volcani Center, Bet-Dagan, Israel
Gazit, S., Inst. of Hort., Agric. Res. Org., Volcani Center, Bet-Dagan, Israel, Kennedy-Leigh Ctr. for Hort. Res., Hebrew University of Jerusalem, Rehovot, Israel
Outcrossing rate, yield, and selective fruit abscission in 'Ettinger' and 'Ardith' avocado plots
The reciprocal effect of two avocado (Persea americana Mill.) cultivars-Ardith and Ettinger-on outcrossing rate and yield was studied in several orchards in Israel. Multilocus estimates of outcrossing rates were made using the isozyme loci Mdh-1 (malate dehydrogenase) and Aat-1 (aspartate aminotransferase) for 'Ettinger' progeny and Lap-2 (leucine aminopeptidase), Pgm-1 (phosphoglucomutase) and Tpi-1 (trinsephosphate isomerase) for 'Ardith' progeny. When the two cultivars were in close proximity, estimated yields ranged from 10 to 20 t·ha-1 and outcrossing rates ranged from 0.71 to 0.89 and from 0.87 to 0.90 for 'Ettinger' and 'Ardith', respectively. The effect of 'Ettinger' as a pollenizer was not restricted to adjacent 'Ardith' trees; it also reached more distant 'Ardith' trees. Thus, outcrossing rate in 'Ardith' was 0.82 a t a distance of 30 m from 'Ettinger' in one orchard and 0.91 at a distance of 36 m in another orchard. These results confirm previous observations that 'Ettinger' is a highly potent pollenizer. Outcrossing rates in 'Ardith' and 'Ettinger' were found to increase from the young fruitlet stage to that of mature fruit. These findings provide evidence for selective abscission of selfed fruitlets. In addition, parentage analysis of abscised versus retained 'Ardith' fruit showed that 'Ardith' selfed fruit abscised at a much higher rate than outcrossed ones. The survival advantage of outcrossed fruit is probably related to the fact that selfed progeny have less-vigorous embryos than outcrossed progeny due to inbreeding depression.
Scientific Publication
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