G arboreum

G. arboreum the tree wool of India, grows as tall as 4.5 to 6.0 m and includes both Indian and Asiatic varieties. Its seeds are covered with greenish gray fu22 fibers below the white lint fibers. 

Four geographical collections of G.. arboreum (G. ar), two collections of . anomalum (G. an), . hirsutum cultivar CAMD-E (G. hi), two . arboreum x . anomalum hybrids and one [(G. arboreum x G. anomalum) x CAMD-E ] hybrid data given as ranges for more than one collection or hybrid. 

The major phytoalexins formed by green tissues (cotyledons, leaves, bracts, and the epicarp of bolls) are the cadal.enes and lacinilines shown in Fig. 2 (12, 18). About 75% of these compounds are methylated in the cultivate 6. hirsutum (19), whereas methylation is either greatly restricted or absenfln the other cultivated cottons (G. arboreum, . herbaceum and Gi. barbadense). These compounds have been demonstFated Tn palisade parenchyma cel Is... 

This a-domain is common to all class I terpene synthases and is the only domain in bacterial and fungal class I enzymes such as the pentalenene synthase from Streptomyces ey oliatus or the trichodiene synthase from Fusarium sporotri-chioides (Fig. 87.14a) [191,194]. Plant hemi-, mono-, and sesquiterpene synthases exhibit a second helical p-domain that resembles a barrel structure. An example of this class is given by the (+)-5-cadinene synthase from G. arboreum (Fig. 87.14b) [195]. In plant diterpene cyclases and in the exceptional case of the ( )-a-bisabolene synthase from A. grandis (Fig. 87.14c), a third helical y-domain with a barrel-like structure is present [197, 200, 202]. The p- and y-domains in the plant enzymes are nonfunctional but are required for correct enzyme folding. 

Fig. 87.14 Three different structure types for class I terpene synthases, (a) The a-type pentalenene synthase from S. exfoliatus (IPSl), (b) a(3-type (+)-5-cadinene synthase from G. arboreum (3G4D), and (c) a(3y-type ( )-a-bisabolene synthase from A. grandis (3SAE)...

C. is a good example for multiple-use crops fiber and seed oil and meal (other examples - linseed and - hemp). New world c. species of commercial importance are G. barbadense L. and G. hirsutum L., old world species are G. arboreum L. and G. herbaceum. 

Table III. Percentage Distribution of Volatile Terpenes in Pigment Glands of arboreum. G. anomalum. . hirsutum and their Hybrids...

We have also developed stocks that produce mostly raimondal in place of the normal TA in pigment glands. This was accomplished by making the triple-species hybrid [. hirsutum X (. arboreum X G. 

Cotton belongs to the genus Cossypieum, of which there are about 20 species, only four of which are cultivated. The four cultivated species are C. hirsutum, American upland cotton C. barbadense, Egyptian and Sea Island cottons G. herbaceum and C. arboreum, the Asiatic cottons. Each of the four species embraces several varieties. 

Cotton Gossypium arboreum and G. her-baceum). Cotton was grown in the Indus... 

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