Inherent variability in structural and functional traits of xylem among three hop varieties
2018
Intervarietal differences in xylem structure could
significantly affect water transport as well as vulnerability
to cavitations and thus crop yield. Evaluation of crop
varieties with respect to the specific traits can be thus
helpful in breeding and agricultural practice. In the present
study we compared basic anatomical traits (vessel length and
diameter) as well as theoretical and measured hydraulic
conductivities (K) of xylem in stems of three hop varieties
(Agnus, Saaz hop - Osvald's clone 31, Vital). There were no
statistically significant intervarietal differences in measured
K (overall mean 1.68 x 10(-6) m(4)/MPa/s), the ratio between K
and theoretical conductivity (mean = 0.194), as well as vessel
diameter and vessel length distributions. The only noticeable
difference was in the distribution of vessels with the diameter
= 100 mu m which differed in Vital compared to Agnus or
Osvald's clone 31 (Kruskal-Wallis test, P < 0.001). Our results
thus indicate highly conservative nature of xylem basic
functional and anatomical characteristics in hop varieties
studied.
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