PALYNOLOGICAL INVESTIGATIONS ON SOME SELECTED BEE FORAGE PLANTS OF FAMILY FABACEAE USING LIGHT AND SCANNING ELECTRON MICROSCOPY FROM HIMACHAL PRADESH, INDIA

The study aimed to investigate and describe the pollen morphology of six nectariferous and polleniferous members of family fabaceae by using light and scanning electron microscope. Pollen grains of Albizia lebbeck, Bauhinia variegata, Caesalpinia decalpetala, Cassia fistula, Dalbergia sissoo and Robinia pseudoacacia were examined for the morphological characterization. The pollen grains were analysed in terms of aggregation, shape, shape class, size, aperture, polarity, symmetry, surface pattern and exine complexity. All the pollen had solitary grains, except Albizzia lebbeck having compound grains. The shape of pollen grains varies from circular-ovoid in Albizia lebbeck, triangular in Bauhinia variegata, oval in Caesalpinia decapetala, oval / round in Cassia fistula and triangular/round in Dalbergia sissoo and triangular/elongated oval Robinia pseudoacacia. The pollens were either prolate-spheroidal or oblate spheroidal. The size of pollen grains studied ranged from small, medium to large sized among different members of family fabaceae. Most of pollens observed were tricolporate, except pollens of Dalbergia sissoo which were tricolpate and triporate. Exine ornamentation include psilate/faveolate in Albizzia lebbeck, psilate in Dalbergia sissoo and Robinia pseudoacacia, straite –reticulate in Bauhinia variegata, reticulate-rugulate in Cassia fistula and Caesalpinia decapetala. All the pollens observed were isopolar and radially symmetrical. The purpose of this study is to increase knowledge of the aspects related to the variability and to characterize the pollen morphology of some members of family fabaceae and to evaluate the utility of pollen features in order to develop an additional alternative plant material identification tool. Moreover, such studies can be of utmost important to students, researchers, and beekeeping industry, horticulture and forest departments.

تأثير المستخلص الكحولي لبذور نبات الالبيزيا Albizzia lebbeck (L.) في هلاك حشرة خنفساء الدقيق الصدئية Herbst)) Tribolium castaneum

أجريت هذه الدراسة لمعرفة فعالية المستخلص الكحولي لبذور نبات الالبيزيا Albizzia lebbeck (L.) في هلاك حشرة خنفساء الطحين الصدئية Tribolium castaneum في طوري اليرقة والبالغة حيث تم استخدام تراكيز متسلسلة (10,8,6,4,2%) من هذا المستخلص . أوضحت نتائج التحليل الاحصائي أن المستخلص الكحولي حقق نسبة قتل بحدود (33.33%) عند التركيز (10%) بالنسبة للبالغات مقارنة بالسيطرة وان نسبة الهلاك للبالغات كانت ( 10, 13.33 , 16.66 , 20 % ) للتراكيز ( 2 , 4 ,6, 8%) على التوالي . وبلغت نسبة هلاك اليرقات ( 50%) للتراكيز ( 4, 6, 8, 10 % ) في حين حقق التركيز (2%) نسبة هلاك بلغت ( 36.6 %) مقارنة بالسيطرة وعينت قيمة LC90 , LC50 لهلاك اليرقات وكانت (8 %, 46.77 % ) على التوالي .