Abstract
The morphological features of so named “winding layer” in the secondary cell wall of normal and abnormal thin hairs for cotton varieties G. hisutum L., G. barbadense, G. herbaseum L. were studied. Last one is known as defective “thin filament”. The nature and features of normal and thin hairs swelled in cuproammonium solution (Schweitzer’s reagent) is described. The comparative analysis of “winding layer” of two kinds of cotton hairs is performed and it is shown that linear density helixes of winding layer along hair 3-5 times as much than for normal cotton hairs. It is shown that against of normal hairs in thin hairs the cellulose micro fibrils are oriented not under 8-30o (as usual take place for normal cotton hairs) along growth axis. Based on the features of coiled layer of thin cotton hairs the example of pathological defective thin filament is discussed.
Highlights
Citrus is believed to have originated from the region within Northeast India, South China, Indonesia and Peninsular Malaysia
Reduction rate of total dry weight, plant height and stem diameters on seedlings which showed severe symptoms of HLB were higher than the species which showed less HLB symptom, tolerant or resistance species too
It was observed that high reduction rate of total biomass and plant height with the value of 56.2% and 39.4% respectively on infected honey mandarin[2]
Summary
Citrus is believed to have originated from the region within Northeast India, South China, Indonesia and Peninsular Malaysia. It is an extremely important crop on a world basis and the total world production of citrus was estimated at over 73 million metric tons[1]. HLB has destroyed an estimated 60 million trees in Africa and Asia[3,4,5] and occurs in more than 40 countries including Malaysia[1]. Survey done by Azizah and Zazali[6] revealed that approximately 70% of the cultivated area with citrus in Malaysia were affected by HLB disease[6]. HLB is caused by an uncultured phloem limited bacterium that was first characterized in 1994 with the 16S rDNA sequence and classified to be a new genus in the αProteobacteria subdivision[7,8]
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