Author:
Xanthopoulos F. P.,Kechagia U. E.
Abstract
The extent of natural crossing in cotton
(Gossypium hirsutum L.) was studied in 2 experiments
conducted in Greece during 1998 and 1999, using glandless and red-leaf traits
as genetic markers. The glandless line was planted in the middle, and the
red-leaf both in the middle and the corners, of a commercial cotton field. In
the first experiment where estimation of natural crossing was based upon gland
status, the percentage ranged from 1.67% to 2.67% in adjacent
rows, dropped to 1.42% in plants 2 m apart, and declined to almost zero
after 10 m. In the second experiment, where the red-leaf marker gene was used,
the mean of natural crossing was 3.85% in adjacent rows, fell to
2.79% in plants 2 m apart, and progressively diminished to 0.31%
after 10 m. The mean natural outcrossing in different rows was almost the same
in both experiments at the middle of the field and was actually double at the
corners. Differences in the extent of natural crossing between the middle and
the corners of the field continued to be significant up to 4 m distance. In
all cases, distances greater than 10 m among cottons were sufficient to
minimise out-crossing ranges.
Subject
General Agricultural and Biological Sciences
Cited by
20 articles.
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