Symptoms and Treatment of Manganese Deficiency in Cycas revoluta Thunb.

Dehgan, Bijan; Durando, Joseph E.; Yeager, Thomas H.

doi:10.21273/hortsci.29.6.645

Cited by 3 publications

(2 citation statements)

References 16 publications

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“…Blister blight is a common worldwide problem for growers of C. revoluta (Faraz et al, 2020 ; Weber, 1944 ), with the symptom severity being positively associated with manganese (Mn) deficiency (Dehgan et al, 1994 ). The Mn deficiency is often linked to limestone areas (Kavvadias & Miller, 1999 ; Kowalenko & Ihnat, 2010 ), the primary habitats of the Ryukyu populations found in coastal regions.…”

Section: Discussionmentioning

confidence: 99%

Ghost introgression facilitates genomic divergence of a sympatric cryptic lineage in Cycas revoluta

Chang,

Nakamura,

Chao

et al. 2023

Ecology and Evolution

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A cryptic lineage is a genetically diverged but morphologically unrecognized variant of a known species. Clarifying cryptic lineage evolution is essential for quantifying species diversity. In sympatric cryptic lineage divergence compared with allopatric divergence, the forces of divergent selection and mating patterns override geographical isolation. Introgression, by supplying preadapted or neutral standing genetic variations, can promote sympatric cryptic lineage divergence via selection. However, most studies concentrated on extant species introgression, ignoring the genetic legacy of introgression from extinct or unsampled lineages (“ghost introgression”). Cycads are an ideal plant for studying the influence of ghost introgression because of their common interspecific gene flow and past high extinction rate. Here, we utilized reference‐based ddRADseq to clarify the role of ghost introgression in the evolution of a previously identified sympatric cryptic lineage in Cycas revoluta. After re‐evaluating the evolutionary independency of cryptic lineages, the group‐wise diverged single‐nucleotide polymorphisms among sympatric and allopatric lineages were compared and functionally annotated. Next, we employed an approximate Bayesian computation method for hypothesis testing to clarify the cryptic lineage evolution and ghost introgression effect. SNPs with the genomic signatures of ghost introgression were further annotated. Our results reconfirmed the evolutionary independency of cryptic lineage among C. revoluta and demonstrated that ghost introgression to the noncryptic lineage facilitated their divergence. Gene function related to heat stress and disease resistance implied ecological adaptation of the main extant populations of C. revoluta.

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Section: Discussionmentioning

confidence: 99%

Ghost introgression facilitates genomic divergence of a sympatric cryptic lineage in Cycas revoluta

Chang,

Nakamura,

Chao

et al. 2023

Ecology and Evolution

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“…Cycas revoluta is one of the common ornamental trees, grown in temperate, subtropical and tropical areas of the world, more precisely in Miyazaki and Kagoshima Prefectures in Kyushu District down to the Ryukyu Islands, Okinawa Prefecture in Japan (Dehgan et al, 1994;Zarchini et al, 2011). Taxonomically known as the foremost primitive species among the living cycads, this species has been used as an indoor and outdoor landscape plant over decades (Jones, 1994).…”

Section: Introductionmentioning

confidence: 99%

Warm stratification combined with organic manure application enhances seed germination and improves Cycas revoluta growth and development

Benjelloun,

Bouzroud,

Zaid

et al. 2024

Adv. Hort. Sci.

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Cycas revoluta (Sago palm) is one of the widespread ornamental plant, used as an indoor and outdoor plant. Seed propagation is extremely hard and time consuming, given the physical dormancy imposed by hard coat. The use of warm stratification improves seed germination by prompting embryos development. As mean to gain more insight on the beneficial effect of warm treatment on seed germination, histological analysis of warm stratified and untreated embryos was conducted. Our results revealed that warm treatment accelerated embryos development, resulting in a rapid differentiation of embryos’ tissues. α-amylase, GA3 and ABA quantification showed that warm stratified embryos accumulated higher and lower amounts of α-amylase and ABA respectively compared to untreated embryos. Regarding plant development, our results showed that organic manures significantly improved Cycas revoluta growth and development. The best response was recorded with the application of sheep manure. Indeed, sheep manure addition increased plant height, the number of leaves per plant, stip length and width by nearby 188% and 61%, 36% and 17% respectively. In roots, the presence of nodules had been recorded in the three applied treatments and more importantly in the presence of sheep manure. At the physiological level, sheep manure supplementation improved photosynthetic apparatus and nitrogen content in leaves (by 75%), thereby explaining the growth promotion. Taken together, these results underlined the beneficial effect of organic manure on Cycas revoluta growth and development and proposed a new strategy to improve plant growth and development with the use of sheep manure as organic amendment.

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