scholarly journals Intercropping leek ( Allium porrum L.) with dyer’s woad ( Isatis tinctoria L.) increases rooted zone and agro-ecosystem retention of nitrogen

2017 ◽  
Vol 82 ◽  
pp. 21-32 ◽  
Author(s):  
Yue Xie ◽  
Hanne Lakkenborg Kristensen
2006 ◽  
Vol 9 (1) ◽  
pp. 98-101 ◽  
Author(s):  
Ahmad Movahedian ◽  
Hojjat Sadeghi ◽  
Alireza Ghannadi ◽  
Mahin Gharavi ◽  
Sepideh Azarpajooh

1989 ◽  
Vol 268 (2) ◽  
pp. 475-484 ◽  
Author(s):  
Jean-Jacques Bessoule ◽  
Rene Lessire ◽  
Claude Cassagne

1974 ◽  
Vol 14 (2) ◽  
pp. 263-287
Author(s):  
J. G. LAFONTAINE ◽  
A. LORD

Radioautography under both light and electron microscopy was exploited to investigate the structural changes of the chromatin reticulum which characterizes the interphase nucleus of a number of plants. Allium porrum meristematic plant cells were used for this purpose. In this species, the telophase chromosomes uncoil into dense strands which, during the G1 period, gradually give rise to a coarse reticulum. There then follows an extensive unravelling of portions of these strands, and high-resolution radioautography reveals that labelling with tritiated thymidine predominantly occurs over zones of the nucleus consisting of diffuse fine fibrillar material. As the S-period progresses, a chromatin reticulum reappears throughout the nuclear cavity, the tortuous strands being approximately 0.25 µm in diameter. Most of the radioautographic grains still remain over the light nucleoplasmic areas but a number of these are now located on the outermost portion of the dense chromatin profiles. By the end of the S-period, the chromatin strands are slightly thicker (ca. 0.3 µm) and form a looser reticulum. Labelling has decreased noticeably in nuclei of that period, the radioautographic grains being grouped into clusters resting over more or less spherical regions of the chromatin reticulum. Judging from their localization at the surface of the nucleolus or close to the nuclear envelope, these structures correspond to chromocentres. The additional interesting finding that such nuclear structures appear much less compactly organized strongly suggests that chromocentres undergo important conformational modifications during duplication of their DNA.


Author(s):  

Abstract A new distribution map is provided for Botrytis allii Munn. Hosts: Onion (Allium cepa), leek (Allium porrum), shallot (Allium ascalonicum). Information is given on the geographical distribution in Africa, Canary islands, Egypt, Kenya, Morocco, South Africa, Tanzania, Zambia, Asia, Afghanistan, China, Henan, Cyprus, Iran, Iraq, Israel, Japan, Jordan, Korea, Nepal, Pakistan, Saudi Arabia, Taiwan, Vietnam, Australasia & Oceania, Australia, New South Wales, South Australia, Western Australia, Tasmania, Victoria, New Zealand, Europe, Austria, Belgium, Bulgaria, Denmark, Finland, France, Germany, Italy, Netherlands, Norway, Poland, Romania, UK, USSR, Yugoslavia, North America, Canada, Alberta, British Columbia, Manitoba, Ontario, Prince Edward Island, Quebec, Saskatchewan, Mexico, USA, Central America & West Indies, Costa Rica, Guatemala, Jamaica, Panama, Salavador, South America, Brazil, Chile, Venezuela.


2011 ◽  
Vol 27 (4) ◽  
pp. 251-255 ◽  
Author(s):  
David D. Douds ◽  
Gerald Nagahashi ◽  
John E. Shenk

AbstractInoculation with arbuscular mycorrhizal (AM) fungi is a potentially useful tool in agricultural systems with limited options regarding use of synthetic chemicals for fertility and pest control. We tested the response ofAllium porrumcv. Lancelot to inoculation with AM fungi in a field high in available P (169 μg g−1soil) that had been repeatedly cultivated to control weeds. Seedlings were inoculated during the greenhouse production period with a mixed species inoculum produced on-farm in a compost and vermiculite medium withPaspalum notatumFlugge as a nurse host. Inoculated and uninoculated seedlings were the same size at outplanting. Inoculated seedlings were over 2.5-fold greater in shoot weight and shoot P content than uninoculated seedlings at harvest. These results demonstrate the potential yield benefits from inoculation with AM fungi in situations where farm management practices may negatively impact on indigenous populations of AM fungi.


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