Raspberries
Raspberries are found on every continent except Antarctica. The fi rst raspberries were cultivated about 450 years ago, making raspberries a relatively new crop as compared to other fruits, such as apples or peaches. At most, two cultivars were grown in England 350 years ago. Cultivars were...
Đã lưu trong:
| Những tác giả chính: | , |
|---|---|
| Định dạng: | Sách |
| Ngôn ngữ: | English |
| Được phát hành: |
CABI
2014
|
| Những chủ đề: | |
| Truy cập trực tuyến: | https://scholar.dlu.edu.vn/thuvienso/handle/DLU123456789/37177 |
| Các nhãn: |
Thêm thẻ
Không có thẻ, Là người đầu tiên thẻ bản ghi này!
|
| Thư viện lưu trữ: | Thư viện Trường Đại học Đà Lạt |
|---|
| Tóm tắt: | Raspberries are found on every continent except Antarctica. The fi rst
raspberries were cultivated about 450 years ago, making raspberries a
relatively new crop as compared to other fruits, such as apples or peaches.
At most, two cultivars were grown in England 350 years ago. Cultivars were
unnamed until after 1800. During the late 19th century and later in the 20th
century, raspberry plants were taken from the ‘wild’ and from gardens and
crossed to create of spring with large fruit size and disease resistance.
Commercially cultivated raspberries are derived from the European
red raspberry (Rubus idaeus L.) and the North American red (Rubus strigosus
Michx.) and black (Rubus occidentalis L.) raspberries. While R. idaeus L. is
native to Europe, it is a close relative to those in Japan and northern Asia.
The American red raspberry (R. strigosus Michx.) is native to the mountain
areas along the east coast (Georgia to Pennsylvania to Maine), from northern
central states (the Dakotas and to the far north in Canada) and west to
British Columbia, Canada. It has greater winter hardiness than the European
species. Because they are so similar and hybridize easily, some taxonomists
consider them to be the same species. The American black raspberry has a
more southern range than the wild American red raspberry. Hybridization
can occur between the black and red species, producing of spring with purple
fruit. Mutations frequently occur in the red raspberry, giving rise to yellow or
orange fruit. The extreme diverse nature of the genus Rubus, with hundreds
of species of raspberry alone, has provided breeders the opportunity to create
new kinds of cultivars by crossing among distantly related species. In US
breeding programs, the fi rst crosses were made at various individual state
experiment stations in 1909 and at the US Department of Agriculture (USDA)
at Beltsville, Maryland, Corvallis, Oregon and Cheyenne, Wyoming. Crosses
were also made in Canada as early as 1893 and in England and Canada by
private breeders. |
|---|