Abnormal Stomatal Opening in Coconut Palms Affected with Root (Wilt) Disease

Rajagopal, V.; Patil, K. D.; Sumathykuttyamma, B.

doi:10.1093/jxb/37.9.1398

Cited by 13 publications

(15 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Measurements of the water relations of infected palms showed the consequences of the impairment of stomatal regulation, which resulted in greater loss of water, observed earlier by Rajagopal et al (1986). Leaf ^ of of healthy coconut palms ranged from -1-2 to -1-7 MPa in the daytime depending on leaf position and the season (Tables 1 to 3), while the average pre-dawn ijr was -0-23 MPa (Table 3).…”

Section: Discussionmentioning

confidence: 71%

“…In contrast to other diseases caused by mycoplasma-like organisms (MLOs), in the root (wilt) disease of coconut, with which MLOs are associated (Solomon, Govindankutty & Nienhaus, 1983), there was abnormally wide stomatal opening (Rajagopal et al, 1986). The xylem pressure potential of plants affected by lethal yellowing disease of coconut was higher than that of healthy palms, and this was attributed to early stomatal closure (McDonough & Zimmermann, 1979).…”

Section: Discussionmentioning

confidence: 99%

“…West Coast Tall), raised at the Institute Farm, were used in the experiments. Eight-year-old palms were maintained as described earlier (Rajagopal et al, 1986).…”

Section: Methodsmentioning

confidence: 99%

“…Our earlier studies of diseased palms indicated that dysfunction of stomatal regulation occurred. There was abnormally wide stomatal opening (Rajagopal, Patil & Sumathykuttyamma, 1986) and irrespective of the age of the palm, time of day or season, the transpirational loss of water was significantly higher from leaves of diseased palms than from those of healthy palms. This paper reports an investigation of the water relations of healthy and diseased palms.…”

Section: Introductionmentioning

confidence: 97%

See 3 more Smart Citations

Water Relations of Coconut Palms Affected With Root (Wilt) Disease

1987

Self Cite

View full text Add to dashboard Cite

SUMMARYThe water relations of apparently healthy and root (wilt)-diseased coconut palms {Cocos nucifera L.) were investigated. Leaves of diseased palms had lower stomatal resistances (with relatively high transpiration rates) and leaf water potentials than apparently healthy palms. Although there was a small reduction of osmotic potential in leaves of diseased palms, there was almost complete loss of turgor potential, and Haccidity resulted.

show abstract

Section: Discussionmentioning

confidence: 71%

Section: Discussionmentioning

confidence: 99%

“…West Coast Tall), raised at the Institute Farm, were used in the experiments. Eight-year-old palms were maintained as described earlier (Rajagopal et al, 1986).…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

See 2 more Smart Citations

Water Relations of Coconut Palms Affected With Root (Wilt) Disease

1987

Self Cite

View full text Add to dashboard Cite

show abstract

“…It is known that the severity of phytoplasma associated diseases is a result of the interaction between temperature and moisture conditions in the host (Krishnareddy, 2013). Indian studies found that palms with root (wilt) disease had impaired stomatal regulation and this was associated with excessive water loss and leaflet flaccidity (Rajagopal et al, 1986). Aside from such factors that cause stress to the palms, making symptoms more pronounced, there seems to be no evidence that plant nutrition, spacing or other local management practices are able to reduce infection progression the severity of LYD.…”

Section: Disease Managementmentioning

confidence: 99%

Coconut Lethal Yellowing Diseases: A Phytoplasma Threat to Palms of Global Economic and Social Significance

et al. 2016

View full text Add to dashboard Cite

The recent discovery of Bogia coconut syndrome in Papua New Guinea (PNG) is the first report of a lethal yellowing disease (LYD) in Oceania. Numerous outbreaks of LYDs of coconut have been recorded in the Caribbean and Africa since the late Nineteenth century and have caused the death of millions of palms across several continents during the Twentieth century. Despite the severity of economic losses, it was only in the 1970s that the causes of LYDs were identified as phytoplasmas, a group of insect-transmitted bacteria associated with diseases in many other economically important crop species. Since the development of polymerase chain reaction (PCR) technology, knowledge of LYDs epidemiology, ecology and vectors has grown rapidly. There is no economically viable treatment for LYDs and vector-based management is hampered by the fact that vectors have been positively identified in very few cases despite many attempted transmission trials. Some varieties and hybrids of coconut palm are known to be less susceptible to LYD but none are completely resistant. Optimal and current management of LYD is through strict quarantine, prompt detection and destruction of symptomatic palms, and replanting with less susceptible varieties or crop species. Advances in technology such as loop mediated isothermal amplification (LAMP) for detection and tracking of phytoplasma DNA in plants and insects, remote sensing for identifying symptomatic palms, and the advent of clustered regularly interspaced short palindromic repeats (CRISPR)-based tools for gene editing and plant breeding are likely to allow rapid progress in taxonomy as well as understanding and managing LYD phytoplasma pathosystems.

show abstract