Preliminary evaluation and selection of stevia under Malaysian conditions.
Notice bibliographique
Résumé
Accessions of stevia (Stevia rebaudiana Bertoni) were introduced from Russia, Paraguay, Canada, USA and Japan. After vegetative propagation, they were field planted for observations on their leaf yield over harvests in the period of one year. Of the 67 accessions, six with high rates of success in vegetative propagation (thus, yielding more plants) were selected. All of these originated from Canada, except for one from Russia. The selected accessions were evaluated in two field trials, over seven and six harvests. The highest yielding accessions were MSR 028, MR 0 2 and MR 007. MSR 028 topped 0 t/ha in cumulative fresh leaf yields, which is equivalent to 2.8 t/ha dry leaf yield and similar to what has been reported in Canada where stevia is planted as an annual. Thus, ratooning may be able to overcome the problem of early harvests (after month) necessitated by the short daylength conditions in Malaysia. *Rice and Industrial Crops Research Centre, MARDI Headquarters, Serdang, P.O. Box 230 , 50774 Kuala Lumpur, Malaysia **MARDI Bukit Raya, P.O. Box , Pendang Post Office, 06707 Pendang, Kedah, Malaysia Authors’ full names: Tan Swee Lian, Muhammad Ghawas Maarof, Mohamad Najib Mohd Yusof and Zawayi Mat E-mail: sltan@mardi.gov.my © Malaysian Agricultural Research and Development Institute 2008 Introduction Stevia (Stevia rebaudiana Bertoni) is a herbaceous plant originating from Paraguay. The plant, especially the leaves, produces diterpene glycosides, primarily stevioside and rebaudioside, which have a sweetening effect reportedly 40–250 times sweeter than sucrose (Brandle 2004). For this reason, interest in this plant has picked up in recent years because of its potential as a non-calorific natural sweetener – a boon to the health food industry, particularly targeted to individuals with an obesity problem as well as diabetics. Interest in this plant has also arisen in Malaysia as a result of the sugar shortage not too long ago. Except in the extreme northern part of the Peninsula, the generally wet climate of Malaysia does not favour sugarcane cultivation, and the country has been largely dependent on sugar imports to satisfy local demand. Malaysians are known for their ‘sweet tooth’, consuming a lot of sugar not only in their drinks and beverages but also in their snacks, such as traditional cakes. This unhealthy habit may be partially responsible for the alarming rise in diabetic cases – from 0.65% of the population in 960 to 6– 8% in 998 (Mustaffa 998). Apart from a doctoral thesis in 990 (Wong 990), very little research has been carried out on stevia in the country. With the resurgence of interest, in 2004, several introductions were made from various sources which were subsequently evaluated under local conditions. This paper reports preliminary results of these evaluations,
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Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,001 | 0,001 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,001 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».