Terpenoid aldehydes in root-knot nematode susceptible and resistant cotton plants

1994 ◽  
Vol 42 (1) ◽  
pp. 204-208 ◽  
Author(s):  
Nazrin Khoshkhoo ◽  
Paul A. Hedin ◽  
Jack C. McCarty
Keyword(s):  
Root Knot Nematode ◽  
Cotton Plants ◽  
Terpenoid Aldehydes

Effects of bioregulators on the terpenoid aldehydes in root-knot nematode infected cotton plants

1993 ◽  
Vol 41 (12) ◽  
pp. 2442-2446 ◽  
Author(s):  
Nazrin. Khoshkhoo ◽  
Paul A. Hedin ◽  
Jack C. McCarty
Keyword(s):  
Root Knot Nematode ◽  
Cotton Plants ◽  
Terpenoid Aldehydes

Southern Root-Knot Nematode (Meloidogyne incognita) Affects Common Cocklebur (Xanthium strumarium) Interference with Cotton

Weed Science ◽  
2007 ◽  
Vol 55 (2) ◽  
pp. 143-146 ◽  
Author(s):  
Theodore M. Webster ◽  
Richard F. Davis
Keyword(s):  
Yield Loss ◽  
Plant Biomass ◽  
Maximum Yield ◽  
Growth And Yield ◽  
Xanthium Strumarium ◽  
Cotton Yield ◽  
Root Knot Nematode ◽  
Cotton Plants ◽  
Southern Root Knot Nematode ◽  
The Relationship

Southern Root-Knot nematode and common cocklebur interfere with cotton growth and yield. A greater understanding of the interaction of these pests with cotton growth and yield is needed for effective integrated pest management (IPM). An additive design was used in outdoor microplots with five common cocklebur densities (0, 1, 2, 4, and 8 plants per plot) growing in competition with cotton, with and without the presence of southern Root-Knot nematode. Differences in cotton height could not be detected among common cocklebur densities or nematode presence at 3 wk after transplanting (WAT); however, differences in crop height were observed at 5 WAT between nematode treatments. In the absence of nematodes, the relationship between cotton yield loss and common cocklebur density was described by a rectangular hyperbolic regression model (P < 0.0001). Maximum yield loss from common cocklebur in the absence of nematodes exceeded 80%. In the presence of nematodes, there was a linear relationship between cotton yield loss and common cocklebur density (P = 0.0506). The presence of nematodes at each common cocklebur density increased cotton yield loss 15 to 35%. Common cocklebur plant biomass was 25% greater in nematode treatments, likely because of the reduced competitiveness of the cotton plants in these plots. This study demonstrates that multiple pests can interact to cause an additive reduction in crop yield.

Histochemistry and identification of disease-induced terpenoid aldehydes in Verticillium-wilt-resistant and -susceptible cottons

1976 ◽  
Vol 54 (18) ◽  
pp. 2095-2099 ◽  
Author(s):  
M. E. Mace ◽  
A. A. Bell ◽  
C. H. Beckman
Keyword(s):  
Verticillium Wilt ◽  
Verticillium Dahliae ◽  
Cellular Localization ◽  
Fungal Colonization ◽  
Parenchyma Cells ◽  
Cotton Plants ◽  
Terpenoid Aldehydes

Hemigossypol (HG) and 6-methoxyhemigossypol (MHG) were the major terpenoid aldehydes isolated from stem stele tissue of 6-week-old verticillium-wilt-susceptible Rowden and verticillium-wilt-resistant Seabrook Sea Island 12B2 (SBSI) cotton plants infected for 14 days with Verticillium dahliae. HG constituted 90 and 45 mol % and MHG 6 and 41 mol % of the induced terpenoid in the steles of Rowden and SBSI, respectively. No terpenoids were detected in extracts of noninfected steles.The cellular localization of terpenoids in infected and noninfected stems was studied histochemically with a SbCl3 reagent. Terpenoids first occurred in both SBSI and Rowden in scattered, usually solitary, paratracheal parenchyma cells appressed to infected xylem vessels. After extensive fungal colonization, diffusion of induced terpenoids obscured the initial, discrete sites of localization.

Resistance mechanisms ofPrunusrootstocks to root-knot nematode,Meloidogyne incognita

Fruits ◽  
2009 ◽  
Vol 64 (5) ◽  
pp. 295-303 ◽  
Author(s):  
Hang Ye ◽  
Wen-jun Wang ◽  
Guo-jie Liu ◽  
Li-xin Zhu ◽  
Ke-gong Jia
Keyword(s):  
Meloidogyne Incognita ◽  
Resistance Mechanisms ◽  
Root Knot Nematode
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