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Initial Research on the Influence of the Colour of the Pea Leaves on the Infestation by Thrips

100%

Pobożniak M. , Świderski A.

tom Vol. 18, nr 1

83-88

Based on the spectrophotometer analysis and the statistical data processing it was found that the colour of the pea leaves significantly influences the infestation by thrips. The positive correlation was found berween summaty content of chlorophylls in the pea leaves, represented by the absorbance at A. = 680 nm and the average number of thrips. The greater content of the chlorophylls was noticed for the cultivars heavier infested by thrips ('Hazard', 'Walor', 'Jubilat' and 'Maraton') and the lower concentration of chlorophylls was found for the cultivars less infested by thrips.

W wyniku przeprowadzonych analiz spektrofotometrycznych i opracowania statystycznego stwierdzono, że barwa liści grochu ma istotny wpływ na zasiedlenie ich przez wciornastki. Dla badanych odmian stwierdzono pozytywną korelację pomiędzy sumaryczną zawartością chlorofili w liściach grochu, oznaczoną poprzez pomiar absorbancji przy lambda = 680 nm, a średnia liczebnością wciornastków. Odmiany silniej zasiedlane przez wciornastki ('Hazard', 'Walor'. 'Jubilat' i 'Maraton') odznaczały się większa zawartością chlorofili, z kolei mniej licznie zasiedlane odmiany ('Polar' i 'Duet') należały do grupy odmian o mniejszej zawartości chlorofili.

Effects of climate warming on vegetative phenology of the common beech Fagus sylvatica in a submontane forest of the Western Carpathians: two-decade analysis

80%

Schieber B. , Kubov M. , Janik R.

nr 3

The paper examines the results of phenological research on common beech (Fagus sylvatica L.) during a period of 21 years (1995–2015) in the submontane beech forest of central Slovakia (Inner Western Carpathians). We focused on bud-burst, leaf unfolding and leaf colouring. Temporal analysis indicated that the mean monthly air temperature increased, especially from April to August. An extraordinary increase of air temperature in March and April, mostly in the last decade, was detected. The precipitation from May to August varied considerably, but in the range of the long-term mean value. During the study period, the mean/earliest/ latest onset of the bud-burst of common beech was observed on the 110th /101st/120th day of the year (DOY), respectively. As for leaf unfolding 10% and 50% (LU 10 and LU 50), we found the mean/earliest/latest onset on the 114th/103rd/122nd DOY and on the 118th/108th/124th DOY, respectively. The mean/earliest/latest onset of leaf colouring 10% (LC 10) and 50% (LC 50) started on the 272nd/262nd/288th DOY and on 286th/276th/298th, respectively. A medium degree of negative correlation (r = -0.68, P < 0.05) was found between air temperature and spring plant development (LU 50). In contrast, for both the cumulative temperature and precipitation, we found very low correlation with autumnal leaf phenology (r ≤ 0.3, P > 0.05). The vegetation period of the examined tree species lasted for 168 days on average (min/max were 155/183 days). Trend analysis revealed an earlier onset of spring phenophases by 7 days/2 decades. Conversely, a delay of autumnal phenophases by 9 days was recorded, so the vegetation period of beech extended by more than two weeks during the study period.

Changes in pigment levels during senescence of cut leaves of four pot plant species

80%

Wachowicz M. , Rabiza-Swider J. , Skutnik E. , Lukaszewska A.

tom 28