khoaibong2422
Well-Known Member
- Joined
- Jan 17, 2014
- Messages
- 52
- Points
- 0
Hi. Iam new member! I start my work about tobacco germplast. May you give some information about thias worrk? Thanks alot
I had see link you gave me. Thanks alot with base information. However, can you tell me the method description a accession?This is a good tobacco research site. Here's are over 2000 accessions held by the USDA GRIN, listed by country. There are two accessions from Viet Nam: http://www.ars-grin.gov/cgi-bin/npgs/html/tax_stat.pl
Click on a country, click on a name or PI number. This will take you to an information page of that variety. You can click on a picture if it has one to see a bigger picture. Click on the "Observations" link to see the classification, plant and leaf sizes, nicotine, nornicotine content, etc. A lot of valuable information. Click on the PDF link for more information.
This link has the same accessions, but is divided up into classes, such as Burley, Flue Cure, Oriental, Rustica, etc. http://www.ars-grin.gov/cgi-bin/npgs/html/desc.pl?81001
This link shows every accession held: http://www.ars-grin.gov/cgi-bin/npgs/html/tax_acc.pl Just follow the links and play with the site, you will eventually get a feel for how it is laid out. Good luck with your studies. We're here if you have any questions.
now, my station begin to trasplant in the field. And I will descript them (about 40 accesions) at about 45-60 DAP, so if you have standard officiall to descript a accesstions?Chemical composition descriptors shows the chemical makeup of the plant. If you hover your mouse pointer over each descriptor, it will tell you which chemical is being described.
Morphological descriptors defines the plants shape, flower color and other identification values. Again, hover your mouse pointer over the descriptor and it will show what is being described.
Growth descriptors are average measurements of the plant, in centimeters. Hover your mouse pointer over the descriptor and it will tell you which part of the plant the measurements are for, example plant height of topped plant.
Phenological descriptors is Days to Maturity from transplant to 50% of the plants showing one flower. This number just gives you a general idea of Days to Maturity as this is influenced by location, soil, fertilizer, water availability year by year, etc. It's best use is for growers with short growing seasons to determine if the variety might have time to mature in really short growing seasons. Parts of Canada for example. Lakota from Canada has a 90 day growing season.
Production descriptors shows the classifications such as Burley, Flue Cured, Cigar Wrapper, Cigar Filler, etc. Those were commercial designations given to the accessions by GRIN based on use at the time. "Class" for Classification, sometimes they spell it out, sometimes there is a code, BU=Burley, FC=Flue Cured, PR=Primitive, RU=Rustica, CF=Cigar Filler, CB=Cigar Binder, CW=Cigar Wrapper. The cigar classification especially are just the most common use for the variety. All varieties commonly used for cigars can be used for filler, binder or wrapper, with the condition of the leaf being the deciding factor. A perfect leaf will make a good wrapper. Some varieties are just better suited to wrapper production due to the taste on the mouth, as the wrapper is the only leaf that actually makes contact with the user.
"Yield" is average cured leaf weight per plant, measured in grams.