Ultraviolet-B Radiation Effects on Water Relations, Leaf Development, and Photosynthesis in Droughted Pea Plants1

The effects of ultraviolet-B (UV-B) radiation on water relations, leaf development, and gas-exchange characteristics in pea (Pisum sativum L. cv Meteor) plants subjected to drought were investigated. Plants grown throughout their development under a high irradiance of UV-B radiation (0.63 W m−2) were compared with those grown without UV-B radiation, and after 12 d one-half of the plants were subjected to 24 d of drought that resulted in mild water stress. UV-B radiation resulted in a decrease of adaxial stomatal conductance by approximately 65%, increasing stomatal limitation of CO2 uptake by 10 to 15%. However, there was no loss of mesophyll light-saturated photosynthetic activity. Growth in UV-B radiation resulted in large reductions of leaf area and plant biomass, which were associated with a decline in leaf cell numbers and cell division. UV-B radiation also inhibited epidermal cell expansion of the exposed surface of leaves. There was an interaction between UV-B radiation and drought treatments: UV-B radiation both delayed and reduced the severity of drought stress through reductions in plant water-loss rates, stomatal conductance, and leaf area.

English writers: an attempt towards a history of English literature,

Vol. 11 was completed after Morley's death by W. Hall Griffin.

A counter-blaste to tobacco /

The original was printed in 1604 in London by R. B.

The family expositor: or, A paraphrase and version of the New Testament; with critical notes, and a practical improvement of each section ...

Edited by Job Orton.

The effect of metallurgical variables on the fatigue properties of AISI 4340 steel heat treated in the tensile strength range 260,000-310,000 psi

"Materials Laboratory. Contract no. AF 33(616)-3299, Project no. 7360."

The essays of a prentise, in the divine art of poesie : Edinburgh. 1585. A counterblast to tobacco. London, 1604 ...

With reproduction of original t.-p.

Cassell's illustrated history of England.

Includes indexes.

The English reader: or Pieces in prose and poetry, from the best writers; designed to assist young persons to read with propriety and effect ... with a few preliminary observations on the principles of good reading.

Mode of access: Internet.

A counterblaste to tobacco.

Anonymous. By James I.

D. Jaime el conquistador : drama histórico en cinco actos y en verso /

No. 2, in vol. 28 with binder's title: Teatro Español : serie B.

Second address to the landowners of the United Empire /

Appendix includes "Letter of Mons. J.B. Say to H. James, Esq." and "Letter upon the cause of the distress in Ireland."

Calendar of the manuscripts of the Most Honourable the Marquess of Salisbury ... : preserved at Hatfield House, Hertfordshire ...

"The series of these most important political and other documents commences in 1306, but papers of earlier date than the reign of Elizabeth are comparatively few. For the reigns of Elizabeth and James I, however, they constitute a body of state papers illustrative of general events and political transactions, with which the state papers preserved in the Public record office are alone comparable."--Roberts, R. A. The reports of the Historical Mss. Commission. London, 1920.

A collection of scarce and valuable tracts, on the most interesting and entertaining subjects: but chiefly such as relate to the history and constitution of these kingdoms.

Facsimile of illustrated t.-p. (v. 2): Trvth brought to light and discouered by time ... 1651.

The origin of the Reformed church in Germany.

Mode of access: Internet.

A general history of England.

Planned to extend to 1660, but not completed beyond 1654.