FROST TOLERANCE STUDIES ON JOJOBA-SIMMONDSIA CHINENSIS (LINK) SCHNEIDER: CLONAL VARIATION, COMPOSITIONAL RELATIONSHIP AND EFFECT OF CULTURAL PRACTICES (ARIZONA).

Persistent Link:
http://hdl.handle.net/10150/184072
Title:
FROST TOLERANCE STUDIES ON JOJOBA-SIMMONDSIA CHINENSIS (LINK) SCHNEIDER: CLONAL VARIATION, COMPOSITIONAL RELATIONSHIP AND EFFECT OF CULTURAL PRACTICES (ARIZONA).
Author:
KHALAFALLA, MUBARAK SIRELKHATIM.
Issue Date:
1987
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
In 1984 and 1985 visual differences in frost damage were observed among 40 jojoba clones growing in a field in Tucson, Arizona. More detailed data were collected on the clone with the least damage (Clone-1) and the one with the most damage (Clone-2). On 10-ten terminal branch samples, Clone-1 showed an average of 12% leaf damage compared to 35% for Clone-2. Leaf freezing under controlled conditions on a monthly schedule showed that leaves of Clone-1 consistently froze at a lower temperature than Clone-2. Also, a second exotherm occurred in 50% of the samples for Clone-1 whereas a second exotherm occurred in only 15% of the samples of Clone-2. Soil moisture content and plant water potential were measured biweekly. Neither seemed to relate to the differences in freezing tolerance of the two clones. Total nonstructural carbohydrates (TNC), total soluble sugars, sucrose and proline were determined monthly. Accumulation patterns of TNC were similar for the two clones, however, Clone-1 generally accumulated more soluble sugars, sucrose and proline which might have contributed to its freezing tolerance. Growth measurements were recorded monthly to determine whether differences occurred between the two clones. Growth of both clones peaked in the spring, showed minor peaks in summer and ceased in winter. Under greenhouse conditions, pot grown cuttings from Clone-1 and Clone-2 were given zero, six or 12 gm of Osmocote fertilizer and watered at 35 or 70% field capacity to determine the effect of irrigation and fertilization on leaf freezing point. Fertilization significantly increased leaf concentrations of N and P and produced more growth. In the greenhouse study, no differences were found in leaf freezing point due to clones, irrigation or fertilization treatment. Leaves of Clone-1 froze at a higher temperature compared to field grown plants.
Type:
text; Dissertation-Reproduction (electronic)
Keywords:
Jojoba -- Frost protection.; Plants -- Effect of cold on.
Degree Name:
Ph.D.
Degree Level:
doctoral
Degree Program:
Plant Sciences; Graduate College
Degree Grantor:
University of Arizona
Advisor:
Palzkill, David A.

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleFROST TOLERANCE STUDIES ON JOJOBA-SIMMONDSIA CHINENSIS (LINK) SCHNEIDER: CLONAL VARIATION, COMPOSITIONAL RELATIONSHIP AND EFFECT OF CULTURAL PRACTICES (ARIZONA).en_US
dc.creatorKHALAFALLA, MUBARAK SIRELKHATIM.en_US
dc.contributor.authorKHALAFALLA, MUBARAK SIRELKHATIM.en_US
dc.date.issued1987en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractIn 1984 and 1985 visual differences in frost damage were observed among 40 jojoba clones growing in a field in Tucson, Arizona. More detailed data were collected on the clone with the least damage (Clone-1) and the one with the most damage (Clone-2). On 10-ten terminal branch samples, Clone-1 showed an average of 12% leaf damage compared to 35% for Clone-2. Leaf freezing under controlled conditions on a monthly schedule showed that leaves of Clone-1 consistently froze at a lower temperature than Clone-2. Also, a second exotherm occurred in 50% of the samples for Clone-1 whereas a second exotherm occurred in only 15% of the samples of Clone-2. Soil moisture content and plant water potential were measured biweekly. Neither seemed to relate to the differences in freezing tolerance of the two clones. Total nonstructural carbohydrates (TNC), total soluble sugars, sucrose and proline were determined monthly. Accumulation patterns of TNC were similar for the two clones, however, Clone-1 generally accumulated more soluble sugars, sucrose and proline which might have contributed to its freezing tolerance. Growth measurements were recorded monthly to determine whether differences occurred between the two clones. Growth of both clones peaked in the spring, showed minor peaks in summer and ceased in winter. Under greenhouse conditions, pot grown cuttings from Clone-1 and Clone-2 were given zero, six or 12 gm of Osmocote fertilizer and watered at 35 or 70% field capacity to determine the effect of irrigation and fertilization on leaf freezing point. Fertilization significantly increased leaf concentrations of N and P and produced more growth. In the greenhouse study, no differences were found in leaf freezing point due to clones, irrigation or fertilization treatment. Leaves of Clone-1 froze at a higher temperature compared to field grown plants.en_US
dc.typetexten_US
dc.typeDissertation-Reproduction (electronic)en_US
dc.subjectJojoba -- Frost protection.en_US
dc.subjectPlants -- Effect of cold on.en_US
thesis.degree.namePh.D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.disciplinePlant Sciencesen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorPalzkill, David A.en_US
dc.contributor.committeememberBartels, P. G.en_US
dc.contributor.committeememberBessey, P. M.en_US
dc.contributor.committeememberBriggs, R. E.en_US
dc.contributor.committeememberMatsuda, K.en_US
dc.identifier.proquest8712886en_US
dc.identifier.oclc698471602en_US
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