Autor: Singh, P.K. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Provenance variation in seed and seedlings attributes of Quercus glauca Thunb.
Autorzy:: Singh, B.
Saklani, K.P.
Bhatt, B.P.
Powiązania:: https://bibliotekanauki.pl/articles/41772.pdf
Data publikacji:: 2010
Wydawca:: Polska Akademia Nauk. Instytut Dendrologii PAN
Opis:: Provenance variation in seedandseed ling attributes of Quercus glauca Thunb. was investigated. Significant differences were obtained in morphological and seedling attributes with populations. Altitude of seedsource showedsignificant inverse correlation with seedlength, seedweight andseed ling weight. But altitude showedsignificant positive correlation with percentage germination androot collar diameter of seedlings. Significant positive correlation between seed weight and seedling weight was also observed.
Źródło:: Dendrobiology; 2010, 63
1641-1307
Pojawia się w:: Dendrobiology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Passerine birds supporting cross pollination in Erythrina stricta Roxb.
Autorzy:: Khanduri, V.P.
Kumar, K.S.
Sharma, C.M.
Riyal, M.K.
Kar, K.
Singh, B.
Sukumaran, A.
Powiązania:: https://bibliotekanauki.pl/articles/2078260.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:: Ornithophily
pollination
mating system
geitonogamy
pollen grains
Opis:: Erythina stricta is an ecologically important tree species in the rainforests of India and its nectar within the flowers contributes to birds’ diet and survival. Reports on the pollination of this species have not been published so far. We therefore explore the reproductive system of this tree species which has great significance to its ecosystem. Birds have an important role in the reproduction of trees through pollination particularly in tropical areas where reproductive success mostly depends on animal pollinator interactions. Study of visitation and nectar feeding behaviour of birds alongwith breeding system assessment of Erythina stricta. Birds visiting and foraging behaviour was observed during Erythrina stricta flowering season in an indian tropical rainforest. Reproductive system was assessed through controlled pollination experiments. Thirteen bird species were recorded visiting and foraging nectar from the flowers of Erythrina stricta. The maximum numbers of visits recorded were from the Red-vented Bulbul (Pycnonotus cafer, Pycnonotidae). The nectar feeding birds were, either (i) potential pollinator with long bills (e.g. Pycnonotus spp., Chloropsis aurifrons, and Dicrurus spp.) or (ii) nectar robbers with comparatively shorter bills (e.g. Zosterops palpebrosa, Stachyris ruficeps, Macronous gularis, Heterophasia glaciris). Controlled pollination experiments revealed high degree of cross pollination (xenogamy) and self-incompatibility in E. stricta. Birds were more frequent in early mornings and their foraging activity was also observed during evening hours; the frequency however, declined with respect to nectar availability. Long corolla tubes of E. stricta could restrict access to nectar collecting bees
Źródło:: Dendrobiology; 2021, 85; 117-126
1641-1307
Pojawia się w:: Dendrobiology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Salinity stress effects on the growth, morphological, physiological, and biochemical properties of Melia (Melia dubia Cav.) plant
Autorzy:: Kumar, R.
Banyal, R.
Singh, A.
Yadav, R.K.
Sharma, P.C.
Powiązania:: https://bibliotekanauki.pl/articles/2078273.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:: Melia
salt stress
growth
physiology
phenology
biochemical
Opis:: Salinity stress severely affects the growth, physiological and developmental processes in plant species. Melia dubia is an ecologically and economically important tree species of the Indian subcontinent. However, systematic information with respect to the species salt tolerance potential is completely lacking. Under salt stress conditions, determining suitable soil EC range is required for the better survival, growth and productivity of the tree species. In present study, we investigated the effects of different soil salinity (EC 4, 8, and 12) levels on the ion homeostasis, physio-biochemistry, morphology, and growth of M. dubia plant. Results revealed that increase in soil salinity causes higher Na+ content and Na+/K+ ratio, while lower K+ content, in the leaf tissues of M. dubia. The physiological processes such as the photosynthetic rate, stomatal conductance, internal CO2 concentration, and transpiration rate were adversely affected with the increased salt stress levels. Morphological parameters, such as internodal length, petiole length, leaf length, and leaf width also decreased (P<0.05) under saline stress conditions. Results further indicat- ed that salinity levels significantly (P<0.05) affected the M. dubia growth, and the growth rate was found optimum upto 8 EC, thereafter it slightly decreased with the increased salt stress to 12 EC. Our findings showed that increased salinity stress causes significant changes in the physiological, morphological, and growth pattern of M. dubia. Therefore, based on present experiment, we found M. dubia suitable for the salt affected soils of EC 8 with optimum growth rate and at EC 12 with the moderate (20–25%) growth reduction.
Źródło:: Dendrobiology; 2021, 86; 56-68
1641-1307
Pojawia się w:: Dendrobiology
Dostawca treści:: Biblioteka Nauki

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