Electronic Journal of Polish Agricultural Universities (EJPAU) founded by all Polish Agriculture Universities presents original papers and review articles relevant to all aspects of agricultural sciences. It is target for persons working both in science and industry,regulatory agencies or teaching in agricultural sector. Covered by IFIS Publishing (Food Science and Technology Abstracts), ELSEVIER Science - Food Science and Technology Program, CAS USA (Chemical Abstracts), CABI Publishing UK and ALPSP (Association of Learned and Professional Society Publisher - full membership). Presented in the Master List of Thomson ISI.
2004
Volume 7
Issue 1
Topic:
Horticulture
ELECTRONIC
JOURNAL OF
POLISH
AGRICULTURAL
UNIVERSITIES
Warabieda W. , Borkowska B. 2004. CHLOROPHYLL α FLUORESCENCE AS A DIAGNOSTIC TOOL FOR ASSESSMENT OF APPLE RESISTANCE AGAINST TWO-SPOTTED SPIDER MITE (Tetranychus urticae Koch.), EJPAU 7(1), #05.
Available Online: http://www.ejpau.media.pl/volume7/issue1/horticulture/abs-05.html

CHLOROPHYLL α FLUORESCENCE AS A DIAGNOSTIC TOOL FOR ASSESSMENT OF APPLE RESISTANCE AGAINST TWO-SPOTTED SPIDER MITE (TETRANYCHUS URTICAE KOCH.)

Wojciech Warabieda, Bożena Borkowska

 

ABSTRACT



The chlorophyll fluorescence measurements were used as a method of assessing the influence of Tetranychus urticae feeding on photosynthetic apparatus of ‘Lobo’ and ‘Jester’ apple cultivars. The photochemical efficiency measured with such parameters like: the initial fluorescence (F0), the maximum fluorescence (Fm), the ratio of variable to maximum fluorescence (Fv/Fm), and the area under the fluorescence curve (Sc) decreases continuously with increasing infestation by mites. The only parameter not influenced by mites feeding was the half-rise time from F0 to Fm (Tfm). Antennas of both ‘Lobo’ and ‘Jester’ cvs. were similarly injured by mites (comparable decrease of F0) but photochemical reactions of the harvested energy of ‘Jester’ leaves were less influenced by this pest (lower decrease for Fv/Fm). It suggests a higher tolerance of the photosynthetic apparatus of ‘

Key words: apple, biotic stress, mite, resistance, chlorophyll fluorescence.